State v. MacNeill , 397 P.3d 626 ( 2017 )


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    2017 UT App 48
    THE UTAH COURT OF APPEALS
    STATE OF UTAH,
    Appellee,
    v.
    MARTIN J. MACNEILL,
    Appellant.
    Opinion
    No. 20140873-CA
    Filed March 16, 2017
    Fourth District Court, Provo Department
    The Honorable Derek P. Pullan
    No. 121402323
    B. Kent Morgan and Jonathan T. Nish, Attorneys
    for Appellant
    Sean D. Reyes and Tera J. Peterson, Attorneys
    for Appellee
    JUDGE J. FREDERIC VOROS JR. authored this Opinion, in which
    JUDGES GREGORY K. ORME and STEPHEN L. ROTH concurred.
    VOROS, Judge:
    ¶1     Martin J. MacNeill was convicted of murdering his wife
    by overmedicating her then drowning her in a bathtub. At trial
    the prosecution presented testimony from five jailhouse
    informants, all of whom reported hearing MacNeill admit or
    imply that he had killed his wife. MacNeill’s principal claim on
    appeal is that the prosecution team withheld information about
    promises of assistance the State’s lead investigator, Jeff
    Robinson, had made to one of the jailhouse informants. After
    meticulous analysis, the trial court agreed with MacNeill that the
    prosecution had wrongly suppressed relevant impeachment
    evidence, but concluded that the evidence would not have
    altered the trial outcome. We affirm.
    State v. MacNeill
    BACKGROUND 1
    The Crime
    ¶2    MacNeill lived with his wife, Michele, and their four
    minor daughters in Pleasant Grove, Utah. The MacNeills also
    had three adult children; two lived in Utah and one attended
    graduate school out of state. MacNeill practiced psychiatry, and
    Michele tended to their home and children.
    ¶3     MacNeill met Gypsy Gillian Willis online, and the two
    began an affair in November 2005. In March 2007 Michele
    expressed concern to her adult daughter, Alexis, who attended
    graduate school, that MacNeill might be having an affair. After
    reading through his telephone records, Michele discovered the
    identity of MacNeill’s girlfriend. When she confronted MacNeill,
    he claimed she was being “ridiculous.” Shortly after this
    confrontation, MacNeill surprised Michele with a facelift as a
    “present.” He also indicated that he wanted to take her on a two-
    week cruise after her surgery.
    ¶4     Around the same time, during a “heartfelt, tearful lesson”
    at church, MacNeill announced that he had cancer and had “less
    than a year” to live. His health appeared to deteriorate—he
    began limping, walking with a cane, and wearing a surgical
    boot. Despite his claim to neighbors that he “had some
    procedures done [and] was having some complications,”
    MacNeill painted a somewhat different picture of his condition
    at work. He told one colleague that he had a “peripheral
    neuropathy” in his toe that “wouldn’t get better,” another
    colleague that he had “cancer in his big toe,” and yet another
    1. “When reviewing a jury verdict, we examine the evidence and
    all reasonable inferences drawn therefrom in a light most
    favorable to the verdict, and we recite the facts accordingly.”
    State v. Kruger, 
    2000 UT 60
    , ¶ 2, 
    6 P.3d 1116
    .
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    State v. MacNeill
    colleague that he had a “neurological . . . problem similar to
    MS.” But despite his scattered claims of various illnesses during
    that spring, MacNeill remodeled his basement on his own and
    appeared to have no difficulty carrying “giant [slabs] of sheet
    rock” down the stairs.
    ¶5     MacNeill scheduled a consultation with a plastic surgeon
    in March 2007 and attended the consultation with Michele.
    MacNeill was the “dominant personality” at the appointment
    and did “more of the talking” than Michele. Although Michele
    was nervous about having surgery and concerned about the
    associated risks, the recovery, and the downtime, she agreed to
    schedule comprehensive facial surgery for the following month.
    ¶6     MacNeill next scheduled an examination for Michele with
    a primary care physician to determine if it was safe for her to
    proceed with surgery. MacNeill was anxious to complete the
    evaluation so Michele could proceed with the surgery without
    delay. At the appointment, the three discussed Michele’s high
    blood pressure. The primary care physician said that it would be
    ideal to control Michele’s blood pressure before surgery and
    suggested that she postpone the operation. MacNeill expressed
    disappointment with this suggestion. Other than Michele’s
    elevated blood pressure, the primary care physician determined
    that she was in “excellent health.” An EKG revealed that
    Michele’s heart was normal without any arrhythmias or
    evidence of heart disease.
    ¶7    Although the primary care physician recommended that
    Michele delay the procedure, Michele and MacNeill kept the
    appointment for the preoperative evaluation with the surgeon.
    Alexis came home from graduate school to attend the
    appointment with them. Before the appointment, Alexis saw
    MacNeill in his room writing down medications that he wanted
    the doctor to prescribe, using a “dusty” reference book that she
    hadn’t seen him use in perhaps ten or fifteen years. On the way
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    to the appointment, Michele said that she wanted to push the
    appointment back until summer so she could make sure her
    blood pressure would be under control. MacNeill became angry,
    raised his voice, told Michele she could not do that, and said, “If
    you don’t have the surgery now, you’re not getting it.”
    ¶8     At the appointment, neither Michele nor MacNeill
    disclosed the primary care physician’s recommendations,
    although MacNeill did mention that she had “some high blood
    pressure” and “had been prescribed some medication” for it.
    MacNeill directed the discussion about Michele’s postoperative
    medication regimen. After performing a facelift, the surgeon
    typically prescribed a pain reliever (Lortab), an antibiotic
    (cephalexin), a sleeping medication (Ambien), an anti-
    inflammatory (Medral Dose Pack), and an eye ointment
    (erythromycin). Occasionally, he prescribed an anti-nausea
    medication (Phenergan) to patients that complained of nausea
    associated with anesthesia.
    ¶9     Consulting the list he brought with him, MacNeill
    requested four deviations from the surgeon’s usual protocol.
    First, he requested an additional, stronger pain reliever,
    oxycodone, also known as Percocet. Second, he requested Lortab
    in liquid form. Third, he requested more than the typical amount
    of Phenergan, and he requested it in suppository form. Finally,
    he requested the anti-anxiety drug, Valium. MacNeill said that
    “he was just concerned that [Michele] wouldn’t do well without
    having these other options available,” and that he wanted to
    have “all of the options available to [him],” even though Michele
    had told him that she didn’t like to take a lot of medicine. The
    surgeon complied with MacNeill’s requests and gave Michele
    instructions to take one pill at a time and “certainly” to avoid
    taking all of them together. Michele assured the surgeon she
    “was going to try and minimize the amount of medication that
    she took.”
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    ¶10 Two days later, MacNeill drove Michele and Alexis to the
    surgical facility for the operation. The surgery lasted all day, but
    the surgeon told Alexis that he was happy with the results.
    Michele was “in a little bit of pain and groggy” and “wanted to
    stay the night at the hospital.” MacNeill returned to drive
    Michele and Alexis home. When Michele said she wanted to stay
    the night, he became angry and told Michele that they needed to
    go home. But he acquiesced when the surgeon explained that he
    prefers to keep his patients overnight. The surgeon released
    Michele the next morning.
    ¶11 On the day Michele returned home, Alexis acted as her
    caregiver, giving her medications, dressing her wounds, and
    helping her to the bathroom, because Michele was “effectively
    blind.” Alexis kept a log of Michele’s medications on a pad of
    paper and included the time she took each pill and the dose.
    Alexis also kept a log of Michele’s vital signs and food intake in
    what she called her “little black book.” She later combined the
    two logs and placed the pad of paper in a drawer next to
    Michele’s bed. That evening MacNeill insisted that Alexis leave
    the room because he would be taking over Michele’s care. Alexis
    left and slept in her youngest sister’s room.
    ¶12 The next morning Alexis entered her mother’s room and
    noticed that she “appeared to be very sedated.” When Alexis
    tried to wake Michele, she stirred a bit but did not wake up.
    Alexis asked MacNeill what had happened, and he responded
    that he “must have given her too much medicine.” When Alexis
    pressed further, he said he had given Michele Lortab, Valium,
    and Ambien, at which point Michele threw up. He then gave her
    Phenergan, Percocet, and more Lortab. Alexis told her father that
    he was “not to give her any more medicine,” because she
    (Alexis) was “taking over.”
    ¶13 Later that evening Michele told Alexis that MacNeill
    “kept giving [her] medication” and “telling [her] to swallow,”
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    and when she started to throw up he gave her more and more
    medication. Michele stated that she did not want MacNeill to
    give her any more medicine; she felt each different pill “so that if
    [MacNeill] tried to give her anything, she would know what he
    was giving her.”
    ¶14 Alexis continued to care for her mother. Once Michele’s
    bandages came off, her recovery accelerated. By April 10 Michele
    was able to walk around and care for herself. She took no
    Valium, Phenergan, or Ambien. Because Michele was sensitive
    to medications, she tried to take less than the prescribed dosage.
    Although Michele was tapering off her medications, MacNeill
    called the surgeon and asked him to refill Michele’s
    prescriptions for Percocet and Phenergan, which he did at a
    follow-up appointment. Alexis attended the appointment with
    Michele, then returned to school.
    ¶15 The next day MacNeill took the couple’s younger
    daughters to school. Before leaving for school, one of the girls
    entered Michele’s room and found her mother sitting on the
    couch in front of her TV. The girl noticed “nothing odd about
    [Michele’s] behavior.” The two “had a perfectly . . . normal
    conversation” before the girl said goodbye and went to school.
    Alexis called at 8:45 a.m. and Michele said she was “doing great”
    and planned to pick the girls up from school. She did not sound
    confused, and her speech did not sound slurred. At 9:15 a.m.,
    MacNeill called Alexis and left a voicemail urging her to call her
    mother and tell her to stay in bed. Alexis found this strange in
    light of her earlier phone conversation with her mother. Alexis
    called her mother, but Michele did not answer.
    ¶16 MacNeill was to receive an award at work that morning.
    Before the event MacNeill adamantly told the event coordinator
    that he needed his picture taken at the event. After receiving the
    award, he asked the photographer, “Did you get me in that
    picture? Make sure you got me in that picture.” After the
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    photographer assured MacNeill that he was in the picture,
    MacNeill pressed him again, saying, “Maybe you better take a
    second one and make sure you got me in that picture.” After the
    event, MacNeill picked up the couple’s youngest daughter from
    kindergarten at 11:30 a.m.
    ¶17 When MacNeill and his youngest daughter got home, she
    called, “Mom, I’m home.” Michele didn’t answer. The girl
    followed her father into the bathroom and found her mother “all
    the way” in the bathtub, lying in the water, still in her clothes.
    MacNeill told his daughter to run next door for help.
    ¶18 Meanwhile, MacNeill called 911. MacNeill gave the
    dispatcher a false address and hung up. MacNeill called again
    and said, “My wife has fallen in the bathtub . . . [s]he is
    unconscious. She’s under water.” MacNeill said he “couldn’t lift
    her” so he let the water out of the tub. Although the dispatcher
    asked him to stay on the phone, MacNeill hung up again. The
    dispatcher called back, and MacNeill told her that he had “CPR
    in progress.” Although the dispatcher requested that he stay on
    the phone, MacNeill again hung up. He then called a colleague
    at work and told him he was “doing a code on his wife.” At this
    time, MacNeill’s phone rang again—it was Alexis. He told her,
    “Your mother’s in the tub and she’s not breathing.” Alexis
    immediately went to the airport to fly home.
    ¶19 The daughter returned to the bathroom with their
    neighbor. They found MacNeill “hunched over” Michele’s face.
    Michele was face up, her head under the faucet, her legs and feet
    inside the bathtub. Two more neighbors came in and observed
    Michele’s body in the same position: face up, with her head
    under the faucet, and her legs and feet inside the bathtub. They
    lifted Michele out of the tub and MacNeill began CPR. One of
    the neighbors performed chest compressions while MacNeill
    leaned over Michele’s head to periodically administer rescue
    breaths. However, the neighbor did not observe MacNeill’s
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    mouth ever touching Michele’s, nor did Michele’s chest rise and
    fall when MacNeill administered the rescue breaths. Two
    paramedics arrived and took over CPR. When the paramedics
    began CPR, Michele’s color instantly changed from bluish to a
    pink fleshy color. A gurgling sound came from her chest, and
    she expelled quite a lot of fluid from her mouth more than
    once—at least three to four cups the first time and a substantial
    amount the second time.
    ¶20 While the paramedics performed CPR, MacNeill told
    them that he had only been away from the home “for a short
    period of time,” during which Michele “overdosed on her pain
    medication,” slipped in the tub, and hit her head. MacNeill said
    he found Michele face down, “slumped over the tub” with her
    upper body inside the tub and her lower body out of the tub.
    MacNeill then began yelling and became increasingly loud and
    agitated—to the point that the officers and paramedics feared for
    their safety and removed him from the room. Shortly thereafter,
    the ambulance arrived, and MacNeill accompanied Michele to
    the hospital.
    ¶21 Michele was pronounced dead on arrival. The emergency-
    room doctor saw no injuries consistent with falling into the
    bathtub. Because the doctor could not determine the cause of
    death, he called the Medical Examiner’s Office.
    ¶22 The MacNeills’ adult son returned home that evening
    with the son’s girlfriend. MacNeill asked the two to accompany
    him to the bathroom where MacNeill had found Michele that
    morning. The son’s girlfriend noticed that the bathroom was
    clean, with no trace of blood, although MacNeill told her when
    he found Michele that day “there was blood everywhere.”
    MacNeill asked the girlfriend to retrieve Michele’s pills. She
    found various drugs, but some of the bottles had very few pills
    in them. MacNeill and his son counted the pills; MacNeill kept
    repeating, Michele “was not taking her pills.” MacNeill became
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    frustrated, said he “did not want to do this anymore,” and had
    his son’s girlfriend flush the pills down the toilet.
    ¶23 When Alexis returned home that evening, she went
    straight to the bedroom to look for the medications. But the
    room had been “cleaned out.” Items that had been there the day
    before—a hospital bed, stuffed animals, and blankets—had been
    removed. The bathroom rug was gone. While looking for her
    mother’s medication around the house, Alexis found the
    bathroom rug, a pile of wet towels and clothing, and other of
    Michele’s belongings in the garage.
    ¶24 Also gone was the “little black book” in which Alexis
    tracked her mother’s medication intake. Alexis asked MacNeill
    where her mother’s medication was; he told her, “I don’t know. I
    think the police might have taken it.” Alexis found the small pad
    of paper she had tracked Michele’s medication on for the first
    few days after surgery in the drawer where she left it.
    ¶25 When Alexis asked MacNeill what happened, he took her
    into the bathroom to show her how he found Michele. MacNeill
    gave Alexis the same description he had given the paramedics:
    Michele was face down, “slumped over the tub” with her upper
    body inside the tub and her lower body outside the tub. He told
    Alexis that the bath was full and the water was off.
    ¶26 Rachel, the MacNeills’ other adult daughter, arrived later
    that evening. MacNeill said that they “needed to get the autopsy
    done . . . right away” because “he was concerned that there
    would be a police investigation,” and he “didn’t want . . . anyone
    to think he murdered [Michele].”
    ¶27 Although MacNeill had spent his day performing CPR on
    his wife, accompanying her to the hospital, cleaning up her
    personal belongings, tending to his family, and providing his
    neighbors with a tour of the renovations he completed in the
    home, he also spent time that day communicating with Gypsy.
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    The two talked on the phone twice and texted each other thirty
    times.
    ¶28 Several days later, MacNeill spoke with the Medical
    Examiner, Dr. Maureen Frikke. He gave the same account he had
    given the emergency responders and his daughters: he found
    Michele slumped over the tub with her face “completely
    submerged” and her lower body hanging outside of the tub. Dr.
    Frikke determined that the manner of Michele’s death was
    “natural,” and her cause of death was cardiovascular disease
    with hypertension and myocarditis.
    ¶29 Michele’s funeral was held three days later. Before the
    service, MacNeill helped set up, running back and forth from the
    church to his car without a cane. As people started arriving,
    however, he began limping and using the cane. Gypsy attended
    the funeral, and the two texted throughout the service. After the
    funeral, a family friend approached MacNeill and offered to help
    care for his minor daughters. MacNeill told her that he had
    already hired a nanny.
    ¶30 MacNeill’s adult daughters also offered to care for their
    younger siblings, but MacNeill asked Rachel to go with him to
    church to “pray about getting a nanny.” When Rachel arrived,
    MacNeill did not want to go inside, but instead remained on a
    bench outside the church. Soon, a woman approached Rachel
    and MacNeill from the parking lot and said, “I’m so sorry for
    your loss. I was at the funeral.” She told them that her name was
    Gillian and that she had attended nursing school. MacNeill
    asked for her phone number, and “Gillian”—who was actually
    Gypsy Gillian Willis—left. Nine days after Michele’s death,
    MacNeill hired Gypsy as the family nanny and moved her into
    the MacNeill home. However, Gypsy never fulfilled the role of a
    nanny in the MacNeill household—the children were “left
    alone” and took care of themselves.
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    State v. MacNeill
    ¶31 Gypsy and MacNeill travelled to Wyoming, where Gypsy
    introduced him to her family as her fiancé. By the end of the
    summer she held herself out to the public as Gillian MacNeill.
    The two applied for an identification card that listed the date of
    their marriage as April 14, 2007—the day of Michele’s funeral. 2
    ¶32 Having witnessed MacNeill’s behavior after Michele’s
    death, Alexis, Rachel, and Michele’s sister asked investigators to
    re-examine Michele’s manner of death. The Utah County
    Attorney’s Office asked a toxicologist to examine Dr. Frikke’s
    toxicology report from Michele’s autopsy. The report stated that
    at the time of death, Michele’s blood contained Valium, Percocet,
    Phenergan, and Ambien in concentrations likely to render her
    “severely obtunded,” “difficult to arouse,” potentially “asleep,”
    and “unable to respond constructively to [her] environment.”
    The Utah County Attorney’s Office also asked Dr. Todd Grey,
    Dr. Frikke’s successor, to review Dr. Frikke’s conclusions. Dr.
    Grey changed the manner of death from “natural” to
    “undetermined” and changed her cause of death from heart
    disease to the combined effects of heart disease and drug
    toxicity.
    ¶33 In addition to re-examining the physical evidence, the
    State interviewed the MacNeills’ youngest daughter at the
    Children’s Justice Center. She reported that, on the day of
    Michele’s death, MacNeill had picked her up from school and
    the two returned home to find Michele in the bathtub and still in
    her clothes. She explained that MacNeill asked her to go next
    door for help, and after she brought her neighbor back to the
    MacNeill home, the neighbor sent her next door to play with the
    neighbor’s two children, where she remained for the rest of the
    afternoon. Following the CJC interview, state investigators
    2. MacNeill filled out an application for a military identification
    card to provide Gypsy access to a military base in Ogden.
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    requested that Alexis ask the girl several follow-up questions.
    Alexis complied, and the girl provided more detail about the
    position of Michele’s body in the tub, the amount of water in the
    tub, and the items of clothing Michele was wearing.
    ¶34 The State charged MacNeill with murder, a first degree
    felony, and obstruction of justice, a second degree felony.
    The Trial
    ¶35 Before trial, MacNeill moved to exclude the MacNeills’
    youngest daughter from testifying. MacNeill argued that, while
    questioning the girl after the CJC interview, Alexis had used
    improper interview techniques, resulting in “false memories.”
    The trial court granted MacNeill’s motion in part and denied it
    in part. The court ruled that the girl was not competent to testify
    at trial because “after the Children’s Justice Center interview,
    [the youngest MacNeill daughter] was subjected to suggestive
    and repeated questioning about material facts by an untrained
    interviewer with bias as to the suspect’s guilt or innocence and
    bias as to her own pecuniary interests.” But the trial court
    admitted the girl’s CJC interview, and she appeared in court at
    trial for cross-examination.
    ¶36 MacNeill also moved to exclude the testimony of five
    jailhouse informants that the prosecution planned to call. Four
    were federal inmates who had served time with MacNeill before
    the State charged him with murder. 3 One (the State Inmate)
    knew MacNeill from time served together in the Utah County
    Jail. The trial court denied the motion on the ground that “(1) the
    weaknesses of jailhouse informant testimony could be exposed
    through rigorous cross-examination; and (2) the jury would be
    instructed on how to judge the credibility of witnesses, and may
    3. MacNeill served time in federal prison for charges unrelated
    to Michele’s murder.
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    State v. MacNeill
    be instructed on the heightened motive of jailhouse informants
    to misrepresent.” The trial court also ordered that “the State, in
    writing, disclose to the defense with respect to each inmate who
    will testify, any and all benefits promised, expressed or implied,
    realized now or to be realized in the future, in exchange for
    testimony in the MacNeill case, together with any documentation
    of the deal.”
    ¶37 In response to the trial court’s order, the State filed a
    Notice of Benefits Offered or Provided to Jailhouse Informants.
    The State disclosed consideration given to the State Inmate. It
    also represented—falsely, as it turned out—that the four federal
    inmates had not “requested any recommendations [from the
    State], nor has anyone else on [their] behalf. If any such request
    is made it will be honored. Other than that, there is no
    agreement to exchange [the federal inmates’] testimony for
    consideration from the State of Utah. Nothing has been given to
    [them], and there are no promises outstanding.”
    ¶38 On the first day of trial, the court ordered that all
    witnesses be excluded from the courtroom while not testifying
    and also ordered that “fact witnesses shall not watch or listen to
    television, radio, or internet news coverage of the trial while
    under trial subpoena.” The prosecution did not inform the
    federal inmates of the exclusion order for almost a week.
    A.    Medical Testimony
    ¶39 At trial a cardiologist testified that the inflammation in
    Michele’s heart was “benign” and not “severe enough to present
    a significant risk of cardiac death.” Dr. Grey also testified that
    the inflammation was “not very severe.” The State called an
    expert in forensic pathology, who testified that he found no
    evidence of myocarditis. The expert also presented a new theory
    on Michele’s cause of death: drowning.
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    ¶40 The forensic pathologist based his conclusion on five
    facts. First, Michele regurgitated large amounts of water while
    emergency responders performed CPR, indicating that she had
    swallowed water. Second, she had water in her airway, which
    indicated that she had inhaled a significant amount of water.
    Third, her lungs were twice as heavy as typical lungs. Fourth,
    fluid was found in the chambers of her lungs. Finally, her blood
    was significantly diluted, which occurs when someone inhales
    water and it streams into the blood vessels and into general
    circulation.
    B.    The Jailhouse Informants
    ¶41 All five jailhouse informants testified against MacNeill. 4
    Inmate One testified that he knew MacNeill from a prison
    computer class. One night, Inmate One saw a picture of
    MacNeill on a television news show, and while he could not
    hear the audio, he could tell that the show claimed that MacNeill
    had murdered his wife. When Inmate One told MacNeill about
    the television show, MacNeill replied that “[t]hey’re just
    [running the show] because my girlfriend is about to get out.”
    But MacNeill later “opened up about it.” He said that he “gave
    [his wife] some oxy and some sleeping pills and then he . . . got
    her in the bathtub.” MacNeill then said “he had to help her out,”
    and he “held her head under the water for a little while.” When
    Inmate One asked MacNeill why he killed Michele, MacNeill
    responded that “she was in the way” and “she wanted the house
    and the kids,” but that the authorities “couldn’t prove that
    he . . . did anything.”
    4. The trial court ordered that the four federal inmates be
    referred to by number to protect their privacy and safety. We
    refer to them by number as well.
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    ¶42 Inmate One testified that he had not “made any request
    for any consideration.” MacNeill cross-examined Inmate One
    using phone records he had obtained from the prison. In one
    phone call Inmate One told his mother that the State was going
    to offer him a deal, and he would speak with his lawyer to find
    out the details of the deal. In numerous phone calls, he told
    family members that he planned on being released from prison
    by Christmas in exchange for his testimony because MacNeill’s
    trial was scheduled for October 9 to November 9, and he would
    have “from November 9 up until Christmas to get out.” And in a
    phone call with his federal defense investigator, Inmate One
    explained that Jeff Robinson, the Utah County Attorney’s Office
    investigator assigned to MacNeill’s case, had told him that he
    was “willing to help [Inmate One] out in any way that he could.”
    ¶43 MacNeill also confronted Inmate One with evidence of
    communications between Inmate One and Robinson in which
    Robinson stated, “What I really want is to get you out
    [early]. . . . You really are one of my key, absolute key witnesses.
    So it’s really important to us to make sure that you are taken care
    of, and kept safe, and . . . to make sure that your needs are taken
    care of.” MacNeill also pointed out that Robinson had expressed
    a desire to communicate with Inmate One by phone rather than
    email so that MacNeill’s defense attorneys would not learn of the
    communications between the two.
    ¶44 Inmate Two testified that he was MacNeill’s cellmate for
    two years. Inmate Two “heard rumors” that “supposedly
    [MacNeill] murdered his wife” and asked MacNeill whether it
    was true. Inmate Two testified that MacNeill told him that “they
    couldn’t prove it,” and that the medication she was taking was
    prescribed.
    ¶45 Inmate Three testified that he noticed an article about
    MacNeill in People magazine that claimed MacNeill murdered
    his wife. Inmate Three asked MacNeill if he had murdered his
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    wife, to which MacNeill responded, “No, I didn’t murder my
    wife. If I did, they don’t have any evidence of it.”
    ¶46 Inmate Four testified that he had heard that MacNeill
    killed his wife. When Inmate Four asked MacNeill about it,
    MacNeill responded, “The bitch drowned.”
    ¶47 The State Inmate testified that he was housed in the same
    jail unit as MacNeill while MacNeill awaited the murder trial.
    The State Inmate asked MacNeill why he did not wear the same
    required jail-issued shoes as the other inmates, and MacNeill
    responded that he could “get away with a lot of things. For
    instance, . . . I’m getting away with my murder.” When asked if
    MacNeill elaborated on his statement, the State Inmate testified
    that MacNeill stated: “I’m getting away with murdering my
    wife.” The State Inmate testified that when he offered
    condolences for Michele’s death, MacNeill said “Oh, no, I’m glad
    the bitch is dead.”
    ¶48 The jury convicted MacNeill of murder, a first degree
    felony, and obstruction of justice, a second degree felony.
    ¶49 MacNeill filed a post-trial Motion to Arrest Judgment or
    For a New Trial on the ground that the Utah County Attorney’s
    Office failed to disclose exculpatory evidence in the form of
    consideration for Inmate One’s testimony. MacNeill based the
    motion on emails and telephone call recordings from August
    through October. The various communications revealed that
    Inmate One planned on being released from prison in December
    2013 in exchange for his testimony at MacNeill’s trial. And sure
    enough, one week after trial, Robinson wrote letters to the U.S.
    Attorney’s Office and Inmate One’s federal defender highly
    recommending that “leniency be shown to [Inmate One] for his
    truthful and courageous testimony.” Inmate One was released
    from federal custody on December 13, 2013. The communications
    also revealed that, in violation of the court’s exclusion order,
    20140873-CA                   16               
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    State v. MacNeill
    Inmate One viewed portions of the trial testimony on the news
    before his scheduled date to testify.
    ¶50 The trial court found that, although the State failed to
    disclose evidence of the deal between Inmate One and Robinson,
    “a jury possessed of this additional information would not have
    rendered a different verdict.” The court came to this conclusion
    because cross-examination demonstrated (1) that Inmate One
    “was ready to procure and accept early release by whatever
    means it could be obtained,” and (2) that Inmate One believed
    “testifying for the prosecution in Utah [would be] the catalyst for
    his early release.” The trial court found that although the State
    suppressed exculpatory evidence related to Inmate One, the new
    information provided by MacNeill in his post-trial motion was
    cumulative and “would not have been reasonably likely to affect
    the outcome of the trial.” The trial court therefore denied
    MacNeill’s motion.
    ISSUES AND STANDARDS OF REVIEW
    ¶51 MacNeill raises three issues on appeal. First, MacNeill
    contends that the State did not present sufficient evidence to
    support a conviction of murder. “When we consider an
    insufficiency of the evidence claim, we review the evidence and
    all inferences which may reasonably be drawn from it in the
    light most favorable to the verdict of the jury.” State v. Nielsen,
    
    2014 UT 10
    , ¶ 46, 
    326 P.3d 645
     (citation and internal quotation
    marks omitted). We will reverse a guilty verdict “only when the
    evidence, so viewed, is sufficiently inconclusive or inherently
    improbable that reasonable minds must have entertained a
    reasonable doubt that the defendant committed the crime of
    which he or she was convicted.” 
    Id.
     (citation and internal
    quotation marks omitted).
    ¶52 Second, MacNeill contends that the trial court abused its
    discretion when it denied his new trial motion on the ground
    20140873-CA                    17                
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    State v. MacNeill
    that newly discovered impeachment evidence did not create a
    reasonable probability that the result of the proceeding would
    have been different if it had been presented at trial. “A trial court
    has discretion in determining whether to grant or deny a motion
    for a new trial, and we will not reverse a trial court’s decision
    absent clear abuse of that discretion.” State v. Harmon, 
    956 P.2d 262
    , 265–66 (Utah 1998).
    ¶53 Third, MacNeill contends that cumulative prejudice
    stemming from prosecutorial misconduct resulted in the denial
    of his right to a fair trial. When reviewing a claim of cumulative
    error, we “apply the standard of review applicable to each
    underlying claim of error.” State v. Perea, 
    2013 UT 68
    , ¶ 33, 
    322 P.3d 624
     (citation and internal quotation marks omitted).
    ANALYSIS
    I. Sufficiency of the Evidence
    ¶54 MacNeill contends that “the circumstantial evidence in
    this case was far from sufficient to support a conviction.” He
    argues that because “there were no eyewitnesses in this case to
    any event that would have explained the cause of [Michele’s]
    death” and “the investigation failed to reveal any physical
    evidence that would demonstrate that anyone intentionally
    contributed to [Michele’s] death,” “the evidence is insufficient
    for a reasonable jury to convict.”
    ¶55 At trial the State bore the burden of proving beyond a
    reasonable doubt that MacNeill intentionally or knowingly
    caused Michele’s death. See Utah Code Ann. § 76-5-203(2)(a)
    (LexisNexis 2012).
    ¶56 When determining the sufficiency of circumstantial
    evidence, we must “determine (1) whether there is any evidence
    that supports each and every element of the crime charged, and
    20140873-CA                     18                  
    2017 UT App 48
    State v. MacNeill
    (2) whether the inferences that can be drawn from that evidence
    have a basis in logic and reasonable human experience sufficient
    to prove each legal element of the offense beyond a reasonable
    doubt.” State v. Brown, 
    948 P.2d 337
    , 344 (Utah 1997) (citation
    and internal quotation marks omitted).
    ¶57 It is “a well-settled rule that circumstantial evidence alone
    may be sufficient to establish the guilt of the accused.” State v.
    Harris, 
    2015 UT App 282
    , ¶ 9, 
    363 P.3d 555
     (citation and internal
    quotation marks omitted). Indeed, the idea that “circumstantial
    evidence is necessarily less convincing and of less value than
    direct evidence . . . is a misstatement of the law.” State v. Clayton,
    
    646 P.2d 723
    , 725 (Utah 1982) (internal quotation marks omitted).
    On the contrary, “[c]ircumstantial evidence may even be more
    convincing than direct testimony.” State v. Housekeeper, 
    588 P.2d 139
    , 140 (Utah 1978). In sum, “‘[d]irect evidence is not required’
    to establish guilt.” Harris, 
    2015 UT App 282
    , ¶ 9 (quoting State v.
    Nielsen, 
    2014 UT 10
    , ¶ 47, 
    326 P.3d 645
    ). Rather, the prosecution
    may present “a mosaic of circumstantial evidence that
    considered as a whole constitutes proof beyond a reasonable
    doubt.” State v. Mercado, 
    635 A.2d 260
    , 264 n.4 (R.I. 1993).
    ¶58 “[C]redibility is an issue for the trier of fact,” and “in
    reviewing a jury verdict we assume that the jury believed the
    evidence supporting the verdict.” Brown, 948 P.2d at 343–44
    (citation and internal quotation marks omitted). When “the jury
    returns a verdict that is reasonably sustained by circumstantial
    evidence and the inferences drawn from it, we must uphold the
    jury’s verdict.” Nielsen, 
    2014 UT 10
    , ¶ 47.
    ¶59 “A party challenging a fact finding must first marshal all
    record evidence that supports the challenged finding.” Utah R.
    App. P. 24(a)(9). We view this requirement “as a natural
    extension of an appellant’s burden of persuasion.” Nielsen, 
    2014 UT 10
    , ¶ 41.
    20140873-CA                      19                
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    State v. MacNeill
    ¶60 To support his insufficiency claim, MacNeill argues that
    “the only postulation presented by the State suggesting that there
    was a murder and that [MacNeill] committed the alleged murder
    was introduced through testimony of convicted and incarcerated
    felons.” (Emphasis added.) MacNeill further maintains that
    “only one of these informants, [Inmate One,] testified that
    [MacNeill] affirmatively insinuated that he did anything of a
    criminal nature.”
    ¶61 First, Inmate One did testify that MacNeill told him that
    he “gave [his wife] some oxy and some sleeping pills and
    he . . . got her . . . in the bathtub,” and that “he held her head
    under the water for a little while.” But Inmate One was not the
    only inmate witness who testified that MacNeill explicitly
    admitted his guilt. The State Inmate testified that MacNeill told
    him, “I’m getting away with murdering my wife.” He also
    testified that MacNeill said that, before Michele’s death, his
    relationship with her “was going downhill” because she was
    “trying to get his money” and “was not going to let him keep
    cheating.”
    ¶62 Furthermore, a jury verdict is supported not only by the
    testimony admitted into evidence, but also by the inferences that
    a jury may reasonably draw from that testimony. Inmates Two,
    Three, and Four also testified that they asked MacNeill whether
    he murdered his wife. MacNeill answered that “they couldn’t
    prove it,” and, following a denial, that “[i]f I did, they don’t have
    any evidence of it,” and also that “[t]he bitch drowned.” A
    reasonable person could interpret these responses as more likely
    to be offered by a guilty man than an innocent man. Thus, a juror
    believing this testimony could, in light of the totality of evidence
    presented at trial, reasonably infer that MacNeill acknowledged
    having killed his wife.
    ¶63 MacNeill also argues that “the testimony of jailhouse
    informants is known to be unreliable and has a long history of
    20140873-CA                     20                 
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    State v. MacNeill
    leading to wrongful convictions.” This may be true. See, e.g., R.
    Michael Cassidy, “Soft Words of Hope”: Giglio, Accomplice
    Witnesses, and the Problem of Implied Inducements, 98 Nw. U. L.
    Rev. 1129, 1130 (2004) (“It is now widely accepted that the
    practice of conditioning leniency on cooperation in criminal
    cases is rife with the potential for abuse.”). But “credibility is an
    issue for the trier of fact, in this case the jury.” State v. Brown, 
    948 P.2d 337
    , 343 (Utah 1997) (citation and internal quotation marks
    omitted). “We do not ‘sit as a second trier of fact.’” State v. Davis,
    
    2014 UT App 77
    , ¶ 4, 
    324 P.3d 678
     (quoting State v. Boyd, 
    2001 UT 30
    , ¶ 16, 
    25 P.3d 985
    ). Rather, “‘[i]t is the exclusive function of
    the jury to weigh the evidence and to determine the credibility of
    the witnesses.’” 
    Id.
     (quoting State v. Booker, 
    709 P.2d 342
    , 345
    (Utah 1985)).
    ¶64 As explained in the next section of this opinion, defense
    counsel’s cross-examination of the jailhouse witnesses exposed
    cracks in their credibility. Defense counsel thoroughly cross-
    examined both Inmate One and the State Inmate. On cross-
    examination, defense counsel elicited testimony from the State
    Inmate about his prior theft and shoplifting charges, lying to
    police, defrauding his landlord, and running a counterfeit watch
    scheme, as well as his expected consideration in exchange for
    testifying against MacNeill at trial, including consideration that
    the State failed to disclose prior to trial.
    ¶65 Furthermore, the trial court gave an exemplary jury
    instruction on the issue of in-custody-informant credibility. The
    court instructed the jury, “A witness who believes that he may
    be able to obtain his own freedom, or receive a lighter sentence
    by giving testimony favorable to the prosecution, has motive to
    testify falsely. Therefore, you must examine his testimony with
    caution and weigh it with great care.” The court also instructed
    the jury to consider the “criminal history of the informant,”
    whether “the informant has ever changed his or her testimony,”
    whether “the informant has received anything (including
    20140873-CA                       21                 
    2017 UT App 48
    State v. MacNeill
    leniency in prosecution, personal advantage, or vindication) in
    exchange for testimony,” and “[a]ny other evidence related to
    the informant’s credibility.”
    ¶66 In sum, the premise of MacNeill’s argument—that a
    criminal conviction must rest on direct evidence—is incorrect as
    a matter of law, and MacNeill’s claim that only one jailhouse
    informant testified that MacNeill explicitly confessed to the
    murder is incorrect as a matter of fact. Two such informants
    testified that MacNeill admitted to killing his wife, and three
    more testified that MacNeill made statements from which jurors
    could, in light of the totality of the trial evidence, reasonably
    infer that MacNeill killed his wife. So the shortcomings MacNeill
    identifies in the trial evidence simply do not exist. We reject his
    sufficiency claim on this ground alone.
    ¶67 Moreover, as explained above, an appellant challenging a
    jury verdict must “first marshal all record evidence that supports
    the challenged finding.” Utah R. App. P. 24(a)(9). An argument
    that does not fully acknowledge the evidence supporting a
    verdict has little chance, as a matter of logic, of demonstrating
    that the verdict lacked adequate factual support. See Dillon v.
    Southern Mgmt. Corp. Ret. Trust, 
    2014 UT 14
    , ¶ 59, 
    326 P.3d 656
    (citing State v. Mitchell, 
    2013 UT App 289
    , ¶ 31, 
    318 P.3d 238
    ).
    Accordingly, “[a]n appellant cannot demonstrate that the
    evidence supporting a factual finding falls short without giving
    a candid account of that evidence.” 
    Id.
     (citation and internal
    quotation marks omitted).
    ¶68 MacNeill’s brief does not give a candid account of the
    evidence supporting the jury’s verdict. On the contrary, he
    ignores much of that evidence. He argues that the testimony of
    Inmate One constituted “the sole evidence of a homicide.” But
    he fails to acknowledge any of the evidence laid out in
    paragraphs 2 through 33 and 61 through 62 above.
    20140873-CA                    22                
    2017 UT App 48
    State v. MacNeill
    ¶69 Ignoring incriminating evidence does not make it go
    away. The circumstantial evidence recited above gave the jury “a
    basis in logic and reasonable human experience” to conclude
    that MacNeill wanted Michele out of the picture so he could be
    with Gypsy; that MacNeill manipulated Michele into having a
    facelift despite the physician’s concerns about her blood
    pressure; that MacNeill arranged to have available an abundance
    of prescription medications; that Michele was unlikely to have
    voluntarily taken those drugs, because she did not need them,
    did not like taking drugs, and normally used less than
    prescribed; that MacNeill attempted to manufacture a partial
    alibi by ensuring his photograph was taken at his award
    ceremony; that MacNeill gave a false description of the
    positioning of Michel’s body in the tub; that, contrary to his
    explanation, Michele, heavily drugged, drowned in the tub; that
    MacNeill pretended to, but did not, perform CPR on Michele;
    that MacNeill destroyed or attempted to destroy evidence of
    Michele’s murder; that MacNeill manufactured an excuse for his
    inability to lift Michele’s body out of the tub by reporting
    scattered claims of various illnesses to his family and
    coworkers—in short, that MacNeill intentionally or knowingly
    caused Michele’s death. See State v. Brown, 
    948 P.2d 337
    , 344
    (Utah 1997) (citation and internal quotation marks omitted).
    ¶70 Because the jury returned “a verdict that is reasonably
    sustained by circumstantial evidence and the inferences drawn
    from it, we must uphold the jury’s verdict.” See State v. Nielsen,
    
    2014 UT 10
    , ¶ 47, 
    326 P.3d 645
    . Although MacNeill maintains
    that the circumstantial evidence was insufficient to support his
    conviction, we are satisfied that the evidence presented at trial
    supports every element of the crime charged, and “the
    inferences that can be drawn from that evidence have a basis in
    logic and reasonable human experience sufficient to prove each
    legal element of [murder] beyond a reasonable doubt.” See
    Brown, 948 P.2d at 344 (citation and internal quotation marks
    omitted). MacNeill has presented nothing suggesting that the
    20140873-CA                    23               
    2017 UT App 48
    State v. MacNeill
    evidence was “sufficiently inconclusive or inherently improbable
    that reasonable minds must have entertained a reasonable doubt
    that the defendant committed the crime of which he [or she] was
    convicted.” See 
    id.
     (alteration in original) (citation and internal
    quotation marks omitted). Accordingly, we reject MacNeill’s
    challenge to the sufficiency of the evidence.
    II. Impeachment Evidence
    ¶71 MacNeill challenges the trial court’s denial of his motion
    to arrest judgment or for a new trial. MacNeill contends that “the
    prosecution withheld impeachment evidence that would have
    undermined the credibility of the State’s only witness” who
    supported the State’s murder case. Specifically, MacNeill argues
    that he “suffered extreme prejudice by being denied the
    opportunity to fully cross-examine [Inmate One] with the facts
    that would demonstrate his lack of credibility.”
    ¶72 The withholding “by the prosecution of evidence
    favorable to an accused upon request violates due process where
    the evidence is material either to guilt or to punishment,
    irrespective of the good faith or the bad faith of the prosecution.”
    Brady v. Maryland, 
    373 U.S. 83
    , 87 (1963); see also State v. Bakalov,
    
    1999 UT 45
    , ¶ 30, 
    979 P.2d 799
    . The duty to preserve such
    evidence “applies both to substantively exculpatory evidence
    and to that which may be used for impeachment.” State v. Bisner,
    
    2001 UT 99
    , ¶ 32, 
    37 P.3d 1073
     (citing United States v. Bagley, 
    473 U.S. 667
    , 676 (1985); Giglio v. United States, 
    405 U.S. 150
    , 154–55
    (1972)).
    ¶73 “[A] Brady violation occurs only where the state
    suppresses information that (1) remains unknown to the defense
    both before and throughout trial and (2) is material and
    exculpatory, meaning its disclosure would have created a
    ‘reasonable probability’ that ‘the result of the proceeding would
    have been different.’” 
    Id. ¶ 33
     (additional citation and internal
    quotation marks omitted). It is “the cumulative or collective
    20140873-CA                     24                 
    2017 UT App 48
    State v. MacNeill
    effect of the evidence that is weighed when determining whether
    the disclosure would have created a reasonable probability of a
    different result.” Tillman v. State, 
    2005 UT 56
    , ¶ 32, 
    128 P.3d 1123
    .
    However, when evidence is “cumulative of other impeachment
    evidence available at trial,” it does “not constitute material
    evidence for Brady purposes.” 
    Id. ¶ 37
    .
    ¶74 Before trial, the State filed a Notice of Benefits Offered or
    Provided to Jailhouse Informants asserting that the State had
    promised and could promise Inmate One nothing in exchange
    for his testimony:
    The State of Utah has no authority over federal
    inmates and had nothing to offer Inmate #1 in
    exchange for his cooperation in the investigation
    and his testimony at trial. There is no agreement
    [to] exchange Inmate #1’s testimony for
    consideration from the State of Utah. Nothing has
    been given to him, and there are no promises
    outstanding. (If Inmate #1 were to request a
    recommendation from Investigator Robinson or
    the prosecution, that request would be honored. To
    date, however, he has not made any requests for
    any consideration.)
    Before filing the Notice of Benefits, a prosecutor met with
    Robinson and asked him what Inmate One had asked for in
    return for his cooperation in the case. Robinson responded that
    Inmate One “had not asked me for anything.”
    ¶75 Despite the State’s claim that it did not offer Inmate One
    any consideration for his testimony and that no promises were
    outstanding, MacNeill discovered evidence during trial showing
    that Robinson had offered to write a letter to the U.S. Attorney’s
    Office and Inmate One’s federal defender in exchange for his
    testimony. MacNeill used that evidence to great effect at trial.
    20140873-CA                     25                 
    2017 UT App 48
    State v. MacNeill
    ¶76 Inmate One testified on direct examination that the Notice
    of Benefits was completely accurate—that his only motives for
    testifying were (1) to protect others and (2) to do the right thing
    as part of Inmate One’s rehabilitation, and that he had done
    nothing to pursue a possible benefit for testifying. But on cross-
    examination, MacNeill confronted him with the following
    evidence: a phone call with his mother, during which he
    admitted that the State was planning to cut him a deal for
    testifying; a statement to his mother that he was “putting that
    date, I’m putting Christmas in my head because the [trial] is
    going from October to November”; a statement to his mother
    that he was planning to “talk with [his niece] and have her crack
    down and see what [Robinson] is going to do . . . . And make
    sure he do the right thing, . . . Because if he ain’t, then I ain’t”; a
    statement to his niece referring to his testimony for the State as
    “Operation Utah”; a statement by his federal defense
    investigator explaining that if his testimony was “really great
    and kind of puts the nail in the guy’s coffin, then you know, you
    might get the two-and-a-half off”; Inmate One’s statement to his
    federal defense investigator that Robinson had told him he was
    “willing to help me out in any way that he could”; a telephone
    call between Inmate One and Robinson in which Robinson told
    Inmate One, “What I really want is to get you out before, and I
    just wish we could do that somehow, some way . . . . [You] really
    are one of my key, absolute key witnesses. So it’s really
    important to us to make sure that you are taken care of, and kept
    safe, and you know, I just want to make sure that your needs are
    taken care of”; a statement by Robinson that he would call
    Inmate One’s federal public defender and defense investigator;
    and a statement by Robinson to Inmate One that he preferred to
    communicate with Inmate One by phone rather than email so
    MacNeill would not learn of the communications. This
    uncontroverted evidence demonstrated that Inmate One had
    falsely testified that he had received no promises of leniency
    from Robinson and that Robinson had falsely represented that
    he had offered no promises of leniency to Inmate One.
    20140873-CA                      26                 
    2017 UT App 48
    State v. MacNeill
    ¶77 But the matter did not end there. After trial, MacNeill
    filed a request under the Freedom of Information Act seeking
    information from the federal prison where Inmate One was
    incarcerated. MacNeill obtained Inmate One’s email and
    telephone correspondence for the months of September and
    October 2013. These communications revealed that Inmate One
    planned on being released from prison in December 2013 in
    exchange for his testimony at MacNeill’s trial. MacNeill also
    obtained an email from Inmate One’s federal defense
    investigator informing Inmate One that he had “talked with the
    investigator out there, that Jeff Robinson will be providing us
    and the U.S. Attorney’s Office with information after the trial
    about what all you did, you know testimony and assistance.”
    And one week after trial, as promised, Robinson wrote a letter to
    the U.S. Attorney’s Office and Inmate One’s federal defender
    highly recommending that “leniency be shown to [Inmate One]
    for his truthful and courageous testimony.”
    ¶78 After receiving this information, MacNeill filed a Motion
    to Arrest Judgment or For a New Trial on the ground that the
    Utah County Attorney’s Office failed to disclose exculpatory
    evidence in the form of consideration for Inmate One’s
    testimony. In support of the State’s opposition to MacNeill’s
    motion for a new trial, Robinson filed an affidavit stating that a
    prosecutor for the State had inquired whether Inmate One had
    asked for anything in return for his cooperation in the case and
    Robinson responded that Inmate One “had not asked me for
    anything.” In the same affidavit, Robinson also stated that he
    “did not think to inform [the prosecutor that talked to him] or
    any of the prosecutors that Inmate #1’s attorney had asked for a
    recommendation if [Robinson] felt comfortable with his
    assistance.”
    ¶79 The trial court meticulously analyzed this issue in a 40-
    page ruling. The court entered 60 findings of fact and 61
    subsidiary findings, and devoted 18 pages to setting forth
    20140873-CA                    27               
    2017 UT App 48
    State v. MacNeill
    conclusions of law. In making its conclusions, the court relied on
    two journal articles, one practice guide, and 16 state and federal
    cases. The court scrupulously examined the evidence withheld
    by the State and declared that Robinson’s claim that he merely
    forgot to tell prosecutors that Inmate One had requested
    consideration for his testimony and he had agreed to give it “in
    the face of direct questioning tests the bounds of credulity.” 5
    ¶80 The trial court concluded that the State suppressed
    exculpatory evidence related to Inmate One, specifically,
    evidence showing that Inmate One had asked for a
    recommendation letter and that Robinson had agreed to provide
    one. The court further concluded that “[t]his information
    remained unknown to defense counsel before and throughout
    trial.” The court also observed that “the State’s attempt to down-
    play the importance of Inmate 1’s trial testimony rings hollow,”
    5. The court made an in-depth examination of the inherent risk
    of using jailhouse informant testimony. The court quoted a 2007
    policy review that explained jailhouse informants’ motives to
    fabricate testimony and opined that “there is a high risk of
    pivotal, but perjured testimony” and therefore “the prosecutor’s
    professional responsibilities are a critical safeguard to
    preventing wrongful convictions.” The court emphasized that
    “[p]rosecutors do not have a duty to ‘make an investigation on
    behalf of the defendant’ or to ‘search[] for exculpatory and
    mitigating evidence,’” but “[g]iven the powerful incentive
    informants have to fabricate evidence favorable to the
    government and the prosecutor’s primary duty to do justice,
    prosecutors should undertake meaningful efforts to corroborate
    information provided by jailhouse informants, and to investigate
    informant reliability.” (Quoting State v. Pliego, 
    1999 UT 8
    , ¶ 9, 
    974 P.2d 279
    ). The court concluded that in this case it was “unclear
    what effort prosecutors took to arrive at a reasonable belief that
    Inmate[] 1 [was] providing truthful information.”
    20140873-CA                     28                 
    2017 UT App 48
    State v. MacNeill
    and that if “MacNeill had only to show that the State committed
    serious errors in this case, his motion for new trial would be
    granted.” But, as the trial court explained, “the law requires
    more.”
    ¶81 The trial court concluded that “after careful review of the
    record, . . . disclosure  of   Inmate    1’s   request     for  a
    recommendation letter, and Robinson’s promise to provide it
    would not have been reasonably likely to affect the outcome of
    the trial” in light of defense counsel’s “withering cross-
    examination.” The court reasoned that by the “use of Inmate 1’s
    prison emails and telephone conversations, defense counsel
    painted Inmate 1 for what he was—a calculating and
    sophisticated convict, ready to say or do anything necessary to
    get out of prison early.” The court characterized Inmate One’s
    cross-examination as “long, pointed, and devastating.” The court
    explained that Inmate One’s “true motives for testifying in Utah
    were revealed. It was clear that he had every intention of asking
    for and accepting anything he could get . . . to secure his early
    release.” After careful review of Inmate One’s trial testimony on
    cross-examination and the evidence withheld by the State, the
    court concluded that “a jury possessed of this additional
    information would not have rendered a different verdict.”
    ¶82 MacNeill claims that in ruling on his motion for new trial,
    “the trial court erroneously neglected to discern the prejudice
    resulting from the introduction of the only damning evidence in
    this case: tainted testimony from an informant who had been
    given consideration, in this case a release from prison, and who
    attempted to conform his story by observing prior evidence
    introduced in the case that he saw while watching trial
    testimony on television.” But in challenging the trial court’s
    ruling, MacNeill fails to refute or even acknowledge the trial
    court’s exhaustive memorandum decision. He has made no
    attempt to identify any flaws in the court’s findings or
    conclusions. Because MacNeill has failed to address “the basis of
    20140873-CA                   29                
    2017 UT App 48
    State v. MacNeill
    the district court’s ruling, we reject this challenge.” See Golden
    Meadows Props., LC v. Strand, 
    2010 UT App 257
    , ¶ 17, 
    241 P.3d 375
    .
    ¶83 Nor has MacNeill analyzed his claim under the
    framework of Brady v. Maryland, 
    373 U.S. 83
     (1963). An
    adequately briefed argument must “contain the contentions and
    reasons of the appellant with respect to the issues presented,
    including the grounds for reviewing any issue not preserved in
    the trial court, with citations to the authorities, statutes, and
    parts of the record relied on.” Utah R. App. P. 24(a)(9). “An
    appellant that fails to devote adequate attention to an issue is
    almost certainly going to fail to meet its burden of persuasion. A
    party must cite legal authority on which its argument is based
    and then provide reasoned analysis of how that authority should
    apply in the particular case, including citations to the record
    where appropriate.” Bank of America v. Adamson, 
    2017 UT 2
    , ¶ 13.
    In short, an issue is inadequately briefed “when the overall
    analysis of the issue is so lacking as to shift the burden of
    research and argument to the reviewing court.” State v. Thomas,
    
    961 P.2d 299
    , 305 (Utah 1998).
    ¶84 MacNeill cites Giglio v. United States, 
    405 U.S. 150
     (1972),
    in support of his claim that “failure to provide evidence of any
    understanding or agreement with a key witness in exchange for
    testimony that would be relevant to that witness’s credibility,”
    “will result in the reversal of any verdict of guilt and will require
    a new trial.” But he fails to develop any analysis beyond that
    assertion. He does not engage in an analysis under either
    Giglio or Brady to demonstrate why the evidence he received
    after trial was “material either to guilt or punishment.” See
    Brady, 
    373 U.S. at 87
    . Because MacNeill has failed to address the
    trial court’s detailed ruling, failed to develop his citation to
    authority, and failed to provide any reasoned analysis based on
    that authority, we conclude that he failed to carry his burden of
    persuasion on appeal. See State v. Roberts, 
    2015 UT 24
    , ¶ 18, 345
    20140873-CA                     30                 
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    State v. MacNeill
    P.3d 1226 (holding that “our adequate briefing requirement
    is . . . a natural extension of appellant’s burden of persuasion”
    (citation and internal quotation marks omitted)). We reject his
    claim on this ground.
    ¶85 Moreover, we discern no flaw in the trial court’s ruling.
    Robinson’s blatantly false statements had the potential to
    subvert the course of justice. But in the end, they did not. The
    jury learned that Inmate One expected the State to cut him a deal
    for testifying; that he expected to be released before Christmas;
    that if Robinson would not “do the right thing,” neither would
    Inmate One; that the federal defense investigator encouraged
    him to give testimony that “kind of puts the nail in the guy’s
    coffin”; that Inmate One told his federal defense investigator that
    Robinson was “willing to help me out in any way that he could”;
    that Robinson had told Inmate One that he wanted to make sure
    that Inmate One’s “needs are taken care of”; that Robinson told
    Inmate One that he would call his federal public defender and
    defense investigator; and that Robinson preferred to
    communicate by phone rather than email so that MacNeill
    would not learn of the communications.
    ¶86 The jury did not learn that Inmate One’s federal defense
    investigator told Inmate One that Robinson “will be providing
    us and the U.S. Attorney’s Office with information after the trial
    about what all you did, you know testimony and assistance.”
    And of course the jury did not learn that one week after trial, as
    promised, Robinson wrote a letter to the U.S. Attorney’s Office
    and Inmate One’s federal defender highly recommending that
    “leniency be shown to [Inmate One] for his truthful and
    courageous testimony.” But the trial court correctly ruled that
    this additional evidence was “cumulative of other impeachment
    evidence available at trial,” and therefore it does “not constitute
    material evidence for Brady purposes.” See Tillman v. State, 
    2005 UT 56
    , ¶ 37, 
    128 P.3d 1123
    . Therefore, the trial court did not
    exceed its discretion in denying MacNeill’s motion for a new
    20140873-CA                    31                
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    State v. MacNeill
    trial on this ground. See State v. Harmon, 
    956 P.2d 262
    , 265–66
    (Utah 1998).
    III. Cumulative Error
    ¶87 MacNeill finally contends that he was “denied a fair trial
    as a result of numerous instances of prejudicial prosecutorial
    misconduct.” MacNeill argues that three specific errors denied
    him the right to a fair trial. First, he claims that the State
    “unfairly and improperly coached [Alexis] to convey an
    unsubstantiated non-factual version of the discovery of
    [Michele’s] body and the crime scene for the purpose of
    manufacturing corroboration for the informant’s false
    testimony.” MacNeill argues that the State approached Alexis on
    multiple occasions and asked her to discuss the facts of the case
    with the youngest daughter, who was in her custody at the time.
    Second, MacNeill claims that the State “failed to disclose
    alternative suspects.” Third, he claims that the State “failed to
    follow the trial judge’s order to exclude witnesses.” 6 Under the
    6. MacNeill also seems to claim that the prosecutors’ failure to
    “adhere to their duty to provide discovery after [MacNeill] made
    numerous requests” constitutes error. However, MacNeill
    describes this claim in only two sentences, stating that “trial
    counsel, after discovering thousands of documents that [the
    State] failed to disclose, then filed a motion to disqualify the
    Utah County Attorney’s office from the case. These motions and
    findings of the attorneys and trial judge are illustrative of the
    overall failure and bad faith of the prosecution in discovery
    matters in this case.” The “motions and findings” referenced by
    MacNeill comprise 822 pages of the appellate record. An
    adequately briefed argument must “contain the contentions and
    reasons of the appellant with respect to the issues
    presented . . . with citations to the authorities, statutes, and parts
    of the record relied on.” Utah R. App. P. 24(a)(9). MacNeill did
    (continued…)
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    State v. MacNeill
    doctrine of cumulative error, “we will reverse only if the
    cumulative effect of the several errors undermines our
    confidence . . . that a fair trial was had.” State v. Dunn, 
    850 P.2d 1201
    , 1229 (Utah 1993) (omission in original) (citation and
    internal quotation marks omitted). 7
    A.     The CJC Interview
    ¶88 MacNeill argues that the trial court erred in admitting the
    CJC interview into evidence. Specifically, MacNeill argues that
    admitting the interview was erroneous because the trial court
    found that Alexis improperly influenced the girl’s memory of
    the events on April 11, 2007 by using improper interview
    (…continued)
    not specify which discovery requests the State failed to comply
    with in his claim that prosecutors “failed to adhere to their duty
    to provide discovery after [MacNeill] made numerous requests.”
    Nor does MacNeill indicate any authority that supports his
    assertion that failure to comply with a discovery request
    constitutes error that denied him a fair trial. Accordingly,
    MacNeill has failed to uphold his burden of persuasion on this
    point. See Bank of America v. Adamson, 
    2017 UT 2
    , ¶ 13 (holding
    that an appellant who “fails to devote adequate attention to an
    issue is almost certainly going to fail to meet its burden of
    persuasion”).
    7. A claim of cumulative error—or more accurately, cumulative
    prejudice—generally asserts that errors discussed earlier in the
    brief, even if individually harmless, caused prejudice in
    combination. But MacNeill’s cumulative error argument asserts
    three claims of error not asserted elsewhere in his brief. In any
    event, because we conclude that none of these alleged errors
    were prejudicial, his claim of cumulative prejudice necessarily
    fails.
    20140873-CA                     33                
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    State v. MacNeill
    techniques that planted false memories. “A trial court has broad
    discretion to admit or exclude evidence and its determination
    typically will only be disturbed if it constitutes an abuse of
    discretion.” State v. Whittle, 
    1999 UT 96
    , ¶ 20, 
    989 P.2d 52
    . “A
    trial court abuses its discretion if it acts unreasonably.” 
    Id. ¶89
     With respect to the CJC interview, the trial court found
    that it “was not tainted” because her memories “as expressed in
    that interview are largely consistent with prior statements to
    Alexis and are corroborated by the statements of other witnesses,
    including [MacNeill].” But the court found that “(1) after the CJC
    interview, [the youngest daughter] was subjected to suggestive
    and repeated questioning about material facts by an untrained
    interviewer with bias as to the suspect’s guilt, and with bias as to
    a pecuniary interest; and (2) there is a substantial likelihood that
    these interview techniques implanted false memories or
    distorted real memories in [the youngest daughter],” and
    therefore she was “not competent to testify.”
    ¶90 MacNeill’s claim fails because of chronology. MacNeill
    challenges the trial court’s admission of the CJC interview and
    claims that the trial court erred because it found that Alexis had
    improperly influenced the girl’s testimony. But the improper
    influence that MacNeill claims tainted the girl’s memory
    occurred after the CJC interview. The trial court made detailed
    findings about the unreliability of the girl’s later testimony.
    Based on those findings, it admitted statements made in the CJC
    interview before Alexis questioned the girl, but excluded
    statements made by the girl during or after Alexis’s questioning.
    MacNeill has not demonstrated how the girl’s testimony in the
    CJC interview could be rendered unreliable by later questioning.
    And MacNeill does not challenge the trial court’s finding that,
    “[i]nsofar as her CJC interview is concerned, [the youngest
    daughter] is a competent witness.” Given the trial court’s “broad
    discretion to admit or exclude evidence,” we affirm its decision
    to admit the girl’s CJC interview. See Whittle, 
    1999 UT 96
    , ¶ 20.
    20140873-CA                     34                
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    State v. MacNeill
    B.     Alternative Suspects
    ¶91 MacNeill next argues that the State did not disclose
    information that his son expressed homicidal ideations, because
    doing so would have suggested an alternative perpetrator. The
    record reflects otherwise. During the investigation, investigators
    sent an email to his son’s school about “troubling” comments
    they discovered on his son’s Twitter account. In that email,
    investigators made clear that the young man was “not a suspect
    in the death of his mother.” MacNeill received a copy of this
    email ten months before trial. MacNeill’s claim that the State
    failed to disclose this information at trial thus lacks factual
    support.
    C.     Exclusionary Order
    ¶92 MacNeill finally argues that “the prosecution failed to
    follow the trial judge’s order to exclude witnesses.” The trial
    court ruled on this issue in denying MacNeill’s motion for a new
    trial, but MacNeill does not address the detailed findings made
    by the trial court and makes no attempt to challenge the trial
    court’s conclusion that MacNeill failed to prove prejudice.
    ¶93 “A trial court has discretion in determining whether to
    grant or deny a motion for a new trial, and we will not reverse a
    trial court’s decision absent clear abuse of that discretion.” State
    v. Harmon, 
    956 P.2d 262
    , 265–66 (Utah 1998). “When an exclusion
    order has been violated, the burden is on the accused to
    demonstrate that he has been prejudiced to the extent that a
    mistrial should be granted.” State v. Billsie, 
    2006 UT 13
    , ¶ 12, 
    131 P.3d 239
     (citation and internal quotation marks omitted).
    ¶94 After opening statements, the trial court ordered that all
    fact witnesses “not watch or listen to television, radio, or internet
    news coverage of the trial while under trial subpoena” and that
    the parties shall “inform their respective fact witnesses of this
    exclusion order.” In the words of the trial court, “for reasons that
    20140873-CA                     35                 
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    State v. MacNeill
    remained unexplained—the State did not inform the federal
    jailhouse informants of the exclusion order for almost a week.”
    After trial MacNeill filed a Freedom of Information Act request
    with the Federal Bureau of Prisons and sought disclosure of
    Inmate One’s September and October 2013 telephone
    conversations. These conversations showed that Inmate One
    watched television coverage of the trial even though he testified
    that he did not.
    ¶95 However, Inmate One’s trial testimony was consistent
    with his report to Robinson before trial, with one exception. In
    his initial interview with Robinson, Inmate One reported that
    MacNeill gave Michele “Oxycontin.” At trial, Inmate One
    testified that MacNeill gave Michele “oxy.” When asked on
    cross-examination whether “oxy” meant “Oxycontin,” Inmate
    One responded that “Oxycontin and Oxycodone are the same
    thing. Basically one of them has Tylenol in it or Acetaminophen,
    the other one doesn’t . . . so I might have said Oxycontin or
    Oxycodone, either one.”
    ¶96 The trial court concluded that the State’s failure to inform
    the federal inmates about the exclusion order for almost a week
    did not prejudice MacNeill. We agree. Inmate One’s testimony
    did not change materially, and MacNeill required Inmate One to
    address the inconsistency in his testimony about whether
    MacNeill gave Michele “Oxycontin” or “Oxy.” MacNeill failed
    to demonstrate prejudice, because he could not show that this
    slight difference between Inmate One’s version of events before
    and after viewing television coverage had any effect on the
    verdict. Accordingly, the trial court did not exceed its discretion
    in denying MacNeill’s motion for a new trial on this ground.
    ¶97 In sum, MacNeill has demonstrated no abuse of discretion
    by the trial court. Because “we have found no error in this case,
    the requirements of the cumulative error doctrine are not met.”
    See State v. Killpack, 
    2008 UT 49
    , ¶ 62, 
    191 P.3d 17
    .
    20140873-CA                    36                
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    State v. MacNeill
    CONCLUSION
    ¶98 For the foregoing reasons, the judgment of the trial court
    is affirmed.
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