Richard Djerf v. Charles L. Ryan , 931 F.3d 870 ( 2019 )


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  •                   FOR PUBLICATION
    UNITED STATES COURT OF APPEALS
    FOR THE NINTH CIRCUIT
    RICHARD KENNETH DJERF,                   No. 08-99027
    Petitioner-Appellant,
    D.C. No.
    v.                     2:02-cv-00358-JAT
    CHARLES L. RYAN,
    Respondent-Appellee.              OPINION
    Appeal from the United States District Court
    for the District of Arizona
    James A. Teilborg, District Judge, Presiding
    Argued and Submitted March 26, 2019
    San Francisco, California
    Filed July 24, 2019
    Before: M. Margaret McKeown, Ronald M. Gould,
    and Sandra S. Ikuta, Circuit Judges.
    Opinion by Judge McKeown
    2                         DJERF V. RYAN
    SUMMARY *
    Habeas Corpus / Death Penalty
    The panel affirmed the district court’s dismissal of an
    Arizona state prisoner’s 28 U.S.C. § 2254 habeas corpus
    petition challenging his conviction by guilty plea for four
    counts of first-degree murder and his capital sentence.
    Following a period of appointed representation,
    petitioner waived counsel and represented himself. He
    entered guilty pleas, and counsel resumed representation for
    sentencing.
    The panel held that counsel did not provide
    constitutionally ineffective pre-trial assistance by failing
    adequately to communicate with petitioner or visit him in
    jail, or to diligently interview witnesses, review discovery,
    and examine evidence. The panel concluded that, under any
    standard of review, counsel’s conduct was not objectively
    unreasonable.        Accordingly, petitioner’s claims of
    involuntary waiver of counsel and invalid guilty pleas,
    premised on ineffective pre-trial assistance, failed. Further,
    petitioner’s procedural default of the ineffective assistance
    claims was not excused.
    The panel affirmed the district court’s denial of
    petitioner’s claim that counsel provided ineffective
    assistance during sentencing by failing to investigate,
    develop, and present additional mitigation evidence related
    *
    This summary constitutes no part of the opinion of the court. It
    has been prepared by court staff for the convenience of the reader.
    DJERF V. RYAN                         3
    to his family background and mental health. The panel
    concluded that the state post-conviction court did not
    unreasonably apply Supreme Court precedent in holding that
    there was no ineffective assistance of counsel during
    sentencing, and the district court did not abuse its discretion
    in denying petitioner’s request for an evidentiary hearing on
    that claim.
    Finally, any error in the Arizona court’s impermissibly
    ignoring mitigating evidence of petitioner’s family
    background because it lacked a causal nexus to his crimes
    was harmless.
    COUNSEL
    Therese Michelle Day (argued) and Michael L. Burke,
    Assistant Federal Public Defenders; Jon M. Sands, Federal
    Public Defender; Office of the Federal Public Defender,
    Phoenix, Arizona; for Petitioner-Appellant.
    Ginger Jarvis (argued), Assistant Attorney General; Lacey
    Stover Gard, Chief Counsel; Mark Brnovich, Attorney
    General; Office of the Attorney General, Phoenix, Arizona;
    for Respondent-Appellee.
    4                        DJERF V. RYAN
    OPINION
    McKEOWN, Circuit Judge:
    Richard K. Djerf killed the mother, father, brother, and
    sister of a former friend to avenge a petty theft. He was
    promptly arrested and charged with numerous crimes. After
    a year and a half of appointed representation, he waived
    counsel and represented himself. Djerf pleaded guilty to
    four counts of first-degree murder, and counsel resumed
    representation for sentencing. The trial judge imposed a
    capital sentence for each of the murder convictions. The
    Arizona Supreme Court did the same on de novo review.
    Arizona courts denied Djerf’s requests for post-conviction
    relief, and the district court dismissed his federal habeas
    petition. We affirm.
    FACTUAL BACKGROUND 1
    Djerf and Albert Luna, Jr. were friends from their job at
    the local supermarket, but in early 1993 Albert stole several
    electronics and a firearm from Djerf’s apartment. Djerf
    reported the incident and his suspicions about Albert’s
    involvement to the police, who took no action. Djerf sought
    revenge several months later. Late one morning, Djerf
    arrived at the Luna family home with a handgun, knife, latex
    gloves, handcuffs, and fuse cord, using a vase with fake
    flowers as a ruse to gain entry. Albert’s mother and five-
    year-old brother were home; Djerf bound them and asked the
    mother whether she or her young son should die first and
    whether she knew Albert’s whereabouts. Djerf briefly
    1
    The following account of Djerf’s crimes was set forth by the
    Arizona Supreme Court on direct review. See State v. Djerf, 
    959 P.2d 1274
    , 1279–80 (Ariz. 1998) (en banc).
    DJERF V. RYAN                        5
    untied the mother, forcing her to load electronics and other
    valuables from the home into the family car.
    Several hours later, Albert’s eighteen-year-old sister
    came home. Djerf bound and gagged her, cut off her clothes,
    and raped her before repeatedly stabbing her in the chest and
    head and slitting her throat. Djerf then told Albert’s mother
    what he had done to her daughter.
    Shortly after, Albert’s father came home. Djerf
    handcuffed him and forced him to crawl on all fours and lay
    face down on his bed. Djerf struck him in the head several
    times with a baseball bat, removed his handcuffs, bound his
    hands with tape, and left him for dead. Djerf told the mother
    that he had killed her husband.
    Djerf then attempted, but failed, to snap the boy’s neck
    and to electrocute him with a stripped electrical wire. The
    father, who had survived the earlier beating, charged and
    stabbed Djerf with a pocketknife. During the ensuing
    struggle, Djerf stabbed the father and then fatally shot him
    six times in front of the mother and boy. Djerf asked the
    mother whether she wanted to watch the boy die, or for him
    to watch her die, before shooting both in the head. He
    covered the bodies and the house with gasoline, turned on
    two stove burners, and placed cardboard and a rag on the
    stove, before fleeing the house in the family’s car. The
    cardboard and rag never ignited. When Albert returned to
    the house, he discovered the gruesome scene and notified the
    police.
    Over the next several days, Djerf described the murders
    to his girlfriend and two other friends. Djerf was arrested
    shortly after.
    6                      DJERF V. RYAN
    PROCEDURAL BACKGROUND
    A grand jury charged Djerf with four counts of first-
    degree murder, as well as first-degree burglary, kidnapping,
    sexual assault, aggravated assault, attempted arson, theft,
    and unlawful use of a prohibited weapon. Michael Vaughn
    and Alan Simpson were appointed as counsel, and they
    represented Djerf at numerous hearings over the next year
    and a half. In February 1995, Djerf wrote to the trial judge
    to express his displeasure with the frequency of counsels’
    communication, their responsiveness, and their efforts to
    keep him apprised of trial strategy. Djerf requested that
    Vaughn and Simpson be withdrawn as counsel and asked to
    represent himself.
    At a hearing several days later, the judge questioned
    Djerf at length to ensure he understood the disadvantages of
    self-representation and the severity of the potential penalties
    he faced. Counsel expressed their belief that Djerf was
    competent, but strongly advised against self-representation.
    The judge reiterated this advice, but nonetheless concluded
    Djerf knowingly, intelligently, and voluntarily waived his
    right to counsel, accepted the waiver of counsel, and
    appointed Vaughn and Simpson in an advisory capacity.
    A few weeks later, the State requested an evaluation of
    Djerf’s competence. In a prescreening report, Dr. Jack Potts
    concluded that Djerf understood the nature of the charges
    and possible penalties, the pending proceedings, his
    constitutional rights, and the necessary waiver of those rights
    if he entered a guilty plea. According to the report, Djerf
    understood he faced a “far greater burden” if he represented
    himself, but believed he had “very little to lose” given that
    the case against him was so strong. The report concluded
    that Djerf was competent to represent himself and that
    DJERF V. RYAN                         7
    further evaluation of his competency was unnecessary. The
    trial judge agreed.
    Several months later, Djerf sent a letter to the prosecutor
    offering to accept the maximum non-capital sentences on all
    charges in exchange for an agreement not to pursue the death
    penalty, though he admitted he had little negotiating
    leverage. The prosecutor declined, affirming the State’s
    intention to pursue death sentences on the murder charges.
    The prosecutor offered to dismiss all other charges if Djerf
    would plead guilty to the murder charges “with no
    agreements as to sentence.” Djerf consulted with Vaughn
    and decided to accept the offer. During the change of plea
    hearing, the judge conducted a thorough canvass and
    accepted Djerf’s guilty pleas.
    Several weeks later, in September 1995, Djerf asked to
    remove Vaughn and Simpson as advisory counsel in light of
    their purported lack of attention and failure to communicate,
    and to appoint “effective” and “experienced” counsel for
    sentencing. Djerf stated that he “would prefer that counsel
    represent me for sentencing, but . . . I have pretty much lost
    trust in Mr. Vaughn and Mr. Simpson.” The trial judge
    denied the motion, noting the substantial work counsel had
    performed on Djerf’s case and their considerable experience
    in serious criminal cases. The judge concluded that
    “appoint[ing] some new attorney now at this stage would . . .
    not be in the interest of justice” because it would cause
    further delay and Djerf might have the same complaints
    about different lawyers.
    Djerf ultimately withdrew his waiver of counsel, and the
    court reappointed Vaughn and Simpson.              The State
    presented its aggravation case over the course of five days in
    October 1995.
    8                         DJERF V. RYAN
    After obtaining several continuances, Simpson presented
    Djerf’s mitigation case in February 1996. 2 A jail guard
    testified to Djerf’s conduct in detention, referencing several
    minor disciplinary infractions but indicating he was not an
    especially problematic inmate. Arthur Hanratty, a court-
    appointed investigator, testified about Djerf’s upbringing,
    based on interviews with Djerf’s parents and sister and a
    review of background records, school documents, and other
    materials. Counsel also introduced a recorded interview
    with Djerf corroborating much of Hanratty’s testimony. The
    court then granted continuances for counsel’s ongoing
    development of potential mental health expert evidence.
    Counsel ultimately opted not to present any such evidence.
    In late spring 1996, counsel filed a presentence
    memorandum, and the mitigation hearing resumed, with
    another jail guard testifying to Djerf’s respectful behavior
    and duties as a jail trustee serving meals. At the final
    sentencing hearing several weeks later, Djerf declined
    multiple offers to address the court before a sentence was
    rendered. The judge concluded that the State had proven
    three statutory aggravating factors for each murder and a
    fourth for the murder of the five-year-old boy. See Ariz.
    Rev. Stat. § 13-703(F)(5), (6), (8), (9) (1996). According to
    the judge, Djerf failed to prove any statutory or non-statutory
    mitigating factors: he “failed to show his difficult family
    background is a mitigating circumstance” because “[t]here
    is no evidence that any alleged difficult family background
    had any effect on the defendant’s behavior during these
    killings that was beyond the defendant’s control.” The judge
    2
    Vaughn was unable to attend the hearing because he “had to attend
    to matters in another court.”
    DJERF V. RYAN                          9
    entered capital sentences for each of the four murder
    convictions.
    In May 1998, the Arizona Supreme Court affirmed the
    convictions and, on de novo review, imposed the same
    capital sentences. 
    Djerf, 959 P.2d at 1281
    –90. The court
    decided that Djerf’s pre-trial waiver of counsel was valid and
    that the trial judge did not abuse his discretion by declining
    to conduct a competency hearing. 
    Id. at 1281–84.
    The court
    also concluded that three aggravating factors had been
    proven for all four of the murders, a fourth aggravating
    factor applied to the murder of the boy, and Djerf failed to
    prove any mitigating factors. 
    Id. at 1286–90.
    According to
    the Arizona Supreme Court, Djerf’s difficult family
    background was not mitigating because such evidence “is
    not relevant unless the defendant can establish that his
    family experience is linked to his criminal behavior.” 
    Id. at 1289
    (citing State v. Ross, 
    886 P.2d 1354
    , 1363 (Ariz.
    1994)). The U.S. Supreme Court denied Djerf’s petition for
    writ of certiorari. Djerf v. Arizona, 
    525 U.S. 1024
    (1998)
    (mem.).
    In February 2000, the Arizona Supreme Court appointed
    Jamie McAlister as counsel for Djerf’s state post-conviction
    proceedings. A year and a half later, a different trial judge
    dismissed Djerf’s petition for post-conviction relief. In early
    2002, the Arizona Supreme Court summarily denied a
    petition for review.
    Djerf then filed a federal habeas petition in district court.
    See 28 U.S.C. § 2254. In September 2004, Djerf requested
    discovery and an evidentiary hearing. A year later, the
    district court denied Djerf’s request and dismissed several
    claims as either procedurally barred or non-cognizable. In
    September 2008, the district court denied the remaining
    claims, but granted a certificate of appealability for two of
    10                     DJERF V. RYAN
    them: (i) whether Djerf’s pre-trial waiver of counsel was
    involuntary because he was forced to decide between self-
    representation and incompetent counsel, and (ii) whether
    Simpson and Vaughn provided ineffective assistance of
    counsel during sentencing by failing to investigate and
    present further mitigation evidence related to Djerf’s family
    background and mental health. Djerf appealed.
    In March 2009, Djerf filed another petition for post-
    conviction relief in state court claiming his guilty pleas were
    not knowing, intelligent, or voluntary and that McAlister
    provided ineffective assistance during the initial post-
    conviction proceedings. The state court rejected the first
    claim as precluded because it was denied by the Arizona
    Supreme Court on direct appeal. The court then dismissed
    the second claim on the grounds that Djerf did not have a
    constitutional right to counsel in post-conviction
    proceedings. A few months later, the Arizona Supreme
    Court summarily dismissed the petition.
    In 2012, the U.S. Supreme Court decided Martinez v.
    Ryan, which held that “[i]nadequate assistance of counsel at
    initial-review collateral proceedings may establish cause for
    a prisoner’s procedural default of a claim of ineffective
    assistance at trial.” 
    566 U.S. 1
    , 9 (2012). We granted Djerf’s
    motion for a partial remand to permit him to pursue several
    claims, including whether McAlister’s allegedly inadequate
    representation excused Djerf’s failure to exhaust certain
    claims in the initial state post-conviction proceedings.
    In April 2017, the district court denied all remaining
    claims, holding that Djerf did not establish cause and
    prejudice to set aside the procedural default of his pre-trial
    ineffective assistance claim. On appeal to this court, Djerf
    argued that the Arizona courts impermissibly ignored his
    family background mitigation evidence by employing an
    DJERF V. RYAN                        11
    unconstitutional “causal nexus” test. See generally Eddings
    v. Oklahoma, 
    455 U.S. 104
    (1982). We expanded the
    certificate of appealability to include the causal nexus claim
    and the claims denied by the district court on partial remand.
    JURISDICTION AND STANDARDS OF REVIEW
    We have jurisdiction under 28 U.S.C. §§ 1291 and
    2253(a). We review de novo the district court’s denial of a
    writ of habeas corpus and for clear error its findings of fact.
    Stanley v. Schriro, 
    598 F.3d 612
    , 617 (9th Cir. 2010).
    Because Djerf’s federal habeas petition was filed after April
    24, 1996, he must satisfy the standards set forth in the
    Antiterrorism and Effective Death Penalty Act (“AEDPA”).
    Under AEDPA, we may not grant relief unless a state court’s
    ruling “was contrary to . . . clearly established Federal law[]
    as determined by the Supreme Court,” “involved an
    unreasonable application of” such law, or “was based on an
    unreasonable determination of the facts in light of the
    evidence presented in the State court proceeding.” 28 U.S.C.
    § 2254(d). In conducting this review, we look to the last
    reasoned state court decision for each claim. White v. Ryan,
    
    895 F.3d 641
    , 665 (9th Cir. 2018).
    ANALYSIS
    Djerf contends that Simpson and Vaughn provided
    ineffective assistance during their pre-trial representation.
    He acknowledges that he failed to raise, and therefore
    procedurally defaulted, this claim in the initial state post-
    conviction proceedings. However, he argues that Martinez
    excuses the procedural default, because McAlister’s
    ineffective assistance during post-conviction proceedings
    was the reason he failed to raise the claim. Djerf advances
    two other claims premised on Simpson and Vaughn’s
    purportedly deficient pre-trial representation: his waiver of
    12                    DJERF V. RYAN
    counsel was involuntary because he was forced to decide
    between ineffective counsel and self-representation, and his
    guilty pleas were invalid because the trial judge failed to
    disclose that he was forfeiting his right to proceed with
    competent counsel. Because the record does not establish
    that Simpson and Vaughn’s pre-trial representation was
    constitutionally deficient, the procedural default is not
    excused, and the waiver of counsel and guilty pleas claims
    fail.
    Djerf advances two other claims on appeal. He contends
    that Simpson and Vaughn provided ineffective assistance
    during sentencing by failing to investigate and present
    further evidence of his difficult family background and
    mental health issues. Affording the necessary deference to
    the state court’s denial of this claim under AEDPA, we
    affirm. Finally, Djerf contends that the Arizona courts
    impermissibly ignored mitigating evidence of his family
    background because it lacked a causal nexus to his crimes.
    We conclude any such error was harmless.
    I. Claims   Premised        on     Ineffective   Pre-Trial
    Representation
    As noted, several of Djerf’s claims are premised on
    ineffective pre-trial assistance by Vaughn and Simpson.
    Specifically, Djerf contends that they failed to adequately
    communicate with or visit him in jail, or to diligently
    interview witnesses, review discovery, and examine
    evidence. The record belies these complaints. Jail visitor
    logs and Djerf’s own correspondence demonstrate that
    counsel visited him in the months preceding his request for
    self-representation and communicated with him regularly
    over the telephone and at court. The record likewise
    establishes that counsel performed significant work during
    this time: they interviewed more than fifty witnesses, with
    DJERF V. RYAN                      13
    some interviews lasting several days; they initiated
    negotiations for a plea deal; they filed various motions on
    Djerf’s behalf and attended regular hearings; they prepared
    for parallel, consolidated proceedings involving use and
    treatment of DNA evidence; and they spent nearly an entire
    day reviewing the physical evidence in police custody.
    During his waiver of counsel hearing, and again in a hearing
    at the onset of sentencing proceedings, Djerf acknowledged
    that Vaughn and Simpson had done considerable work on
    his behalf during their months of representation. The record
    demonstrates that brief continuances sought by counsel were
    reasonably necessary to permit the continued preparation for
    trial and accommodate health issues and other case
    responsibilities, not, as Djerf asserts, because counsel had
    failed to start any serious work on his case.
    We see no indication that Simpson and Vaughn’s
    “representation fell below an objective standard of
    reasonableness.” Strickland v. Washington, 
    466 U.S. 668
    ,
    688 (1984). They satisfied their “duty to make reasonable
    investigations” by interviewing dozens of witnesses and
    seeking out and reviewing evidence. 
    Id. at 691.
    The record
    rebuts Djerf’s conclusory allegations that counsel “did
    nothing at all to prepare a defense.” Crandell v. Bunnell,
    
    25 F.3d 754
    , 755 (9th Cir. 1994) (per curiam). At no point
    was there a “complete breakdown in communication,”
    Daniels v. Woodford, 
    428 F.3d 1181
    , 1201 (9th Cir. 2005),
    nor did counsel ever fail to “consult with the defendant on
    important decisions [or] to keep the defendant informed of
    important developments in the course of the prosecution.”
    
    Strickland, 466 U.S. at 688
    . Again, despite Djerf’s
    suggestions to the contrary, the record does not reveal any
    significant periods of time during which counsel failed to
    communicate with or respond to him. See 
    Crandell, 25 F.3d at 755
    (suggesting that complete silence for the first two
    14                           DJERF V. RYAN
    months of representation raised questions about competence
    of counsel). Under any standard of review, Simpson and
    Vaughn’s conduct was not objectively unreasonable.
    Because the record fails to establish that Vaughn and
    Simpson provided constitutionally inadequate pre-trial
    assistance, it also fails to establish that Djerf was forced to
    choose between self-representation and incompetent
    counsel. As a result, his claim that his waiver of counsel was
    involuntary fails. So does his related argument that the trial
    judge erred by failing to further investigate his motivation
    for removing counsel and therefore discover the purportedly
    ineffective representation. 3 Djerf’s challenge to the validity
    of his guilty pleas also fails—the record does not establish
    that counsel were incompetent, so Djerf did not forfeit any
    right to proceed with competent counsel. No clearly
    established Supreme Court precedent entitles Djerf to relief
    on his waiver of counsel and guilty plea claims, and the
    Arizona courts reasonably applied the facts in the record to
    deny them.
    For the same reasons, we conclude that the procedural
    default of the underlying ineffective assistance claim is not
    excused. To excuse a procedural default, a habeas petitioner
    must establish both “cause” and “prejudice.” Coleman v.
    Thompson, 
    501 U.S. 722
    , 750 (1991). Typically, ineffective
    3
    Djerf also argues that his waiver of counsel and request for self-
    representation in February 1995 should have been construed as a request
    to substitute counsel and that the trial court erred by failing to do so. This
    argument is not consistent with the record; Djerf several times expressly
    stated his desire to represent himself, despite strong discouragement
    from the judge and counsel. At no point prior to or during the February
    1995 hearing did Djerf intimate a desire for other counsel. In view of
    this record, the Arizona Supreme Court’s denial of this claim was not an
    unreasonable application of Supreme Court precedent. See 
    Djerf, 959 P.2d at 1283
    –84.
    DJERF V. RYAN                         15
    assistance of post-conviction counsel cannot excuse a
    procedural default. See 
    Martinez, 566 U.S. at 9
    , 13–14.
    However, Martinez created a narrow exception in Arizona
    and other states that bar ineffective assistance claims on
    direct appeal; in those states, the initial collateral
    proceedings are the first opportunity to bring such claims.
    
    Id. The Supreme
    Court subsequently expanded this
    exception, holding that where a “state procedural
    framework, by reason of its design and operation, makes it
    highly unlikely in a typical case that a defendant will have a
    meaningful opportunity to raise a claim of ineffective
    assistance of trial counsel on direct appeal, our holding in
    Martinez applies.” Trevino v. Thaler, 
    569 U.S. 413
    , 429
    (2013). To satisfy “cause” in this context, Djerf must show
    that McAlister was ineffective under Strickland—that is,
    McAlister’s post-conviction representation was deficient
    because she failed to bring the pre-trial ineffective assistance
    claim, and there is a “reasonable probability” that, had the
    claim been raised, “the result of the post-conviction
    proceedings would have been different.” Clabourne v.
    Ryan, 
    745 F.3d 362
    , 377 (9th Cir. 2014), overruled on other
    grounds by McKinney v. Ryan, 
    813 F.3d 798
    , 819 (9th Cir.
    2015) (en banc). To satisfy “prejudice,” Djerf must show
    that the underlying claim is “substantial”—that is, that it has
    “some merit.” 
    Id. There is
    considerable overlap between
    these requirements, since each considers the strength and
    validity of the underlying ineffective assistance claim. See
    
    id. Even if
    we were to assume that Djerf’s pre-trial
    ineffective assistance claim was substantial (which would be
    a stretch in light of the record and the service performed by
    counsel), there is no reasonable probability that advancing
    that claim during initial post-conviction proceedings would
    have altered the result. See Rodney v. Filson, 
    916 F.3d 1254
    ,
    16                     DJERF V. RYAN
    1260 (9th Cir. 2019) (clarifying that a petitioner represented
    by counsel in post-conviction proceedings must satisfy both
    Strickland prongs). Djerf’s post-hoc criticisms of counsel’s
    pace of preparation were contradicted by his statements at
    the time, as well as those of the prosecutor and trial judge.
    The record shows regular visits and communication between
    counsel and Djerf, and Djerf has not identified any authority,
    existing then or now, suggesting that the frequency and
    nature of communication was constitutionally infirm. Even
    if Djerf had been able to show that the representation was
    constitutionally deficient, he would have struggled to show
    that the purported deficiencies resulted in sufficient
    prejudice to warrant overturning his four murder
    convictions. We cannot excuse the procedural default of this
    claim under these circumstances.
    II. Ineffective Representation During Sentencing
    We next turn to Djerf’s claim that Simpson and Vaughn
    rendered ineffective assistance during sentencing by failing
    to further investigate, develop, and present additional
    mitigation evidence related to his family background and
    mental health. The trial judge’s post-conviction denial of
    this claim was the last reasoned state court decision, so we
    review that ruling under AEDPA. See Hibbler v. Benedetti,
    
    693 F.3d 1140
    , 1146 (9th Cir. 2012). In the district court,
    Djerf requested an evidentiary hearing in connection with
    this claim. As explained below, the state post-conviction
    court did not unreasonably apply Supreme Court precedent
    in holding there was no ineffective assistance of counsel
    during sentencing and the district court did not err in denying
    Djerf’s request to expand the record.
    DJERF V. RYAN                       17
    A. Family Background
    Djerf’s argument that counsel provided ineffective
    assistance by failing to obtain more background records and
    conduct more interviews was rejected by the post-conviction
    judge because Djerf failed to present any supporting
    evidence, and instead merely “speculate[d] that if his
    childhood was investigated, some mitigating evidence might
    have been discovered.” We review the post-conviction
    judge’s determination under AEDPA and determine it was
    not an unreasonable application of Supreme Court
    precedent.
    Throughout the entirety of his state post-conviction and
    federal habeas proceedings, Djerf has failed to identify any
    evidence related to his childhood that counsel should have,
    but did not, uncover. Crucially, Djerf did not point the post-
    conviction judge to any evidence sentencing counsel failed
    to present that was meaningfully different from what was
    introduced at mitigation. It was Djerf’s burden to establish
    a reasonable probability that the result of the proceedings
    would have been different but for counsel’s purported errors.
    
    Strickland, 466 U.S. at 694
    . Strickland prejudice is not
    established by mere speculation that witness testimony
    “might have given information helpful to” the defense.
    Bragg v. Galaza, 
    242 F.3d 1082
    , 1088 (9th Cir. 2001).
    Under the significant deference required by AEDPA, the
    post-conviction judge’s denial of this claim was neither an
    unreasonable application of clearly established law nor an
    unreasonable determination of the facts in light of the
    evidence in the record at that time.
    B. Mental Health
    Djerf’s argument that counsel provided ineffective
    assistance by failing to investigate and develop additional
    18                     DJERF V. RYAN
    mental health mitigating evidence was rejected by the post-
    conviction judge for a similar reason: Djerf merely relied on
    expert reports prepared prior to sentencing to speculate that
    “there might be other mitigating information that should
    have been presented.” Under AEDPA, the state court’s
    ruling that Djerf did not suffer ineffective assistance of
    counsel due to the alleged failure to develop additional
    mental health mitigating evidence was not an unreasonable
    application of Supreme Court precedent.
    In his initial post-conviction proceedings, Djerf’s
    appointed mental health expert conducted extensive
    neurological testing. However, Djerf did not introduce any
    reports or other evidence from this expert in support of his
    petition. Instead, he submitted Dr. Potts’s prescreening
    report from April 1995 and reports prepared by Dr.
    McMahon, Dr. Walter, and Dr. Duane prior to sentencing.
    In the winter of 1995–96, Dr. McMahon conducted
    several hours of psychological testing and prepared a report,
    noting that Djerf’s results were suggestive of “learning
    disabilities and/or some diffuse neuropsychological
    dysfunction.” He recommended further evaluation. Dr.
    Walter then completed neuropsychological testing; he
    reported that Djerf performed “relatively well in [a] number
    of areas,” though there were indications that he might have
    a “focal cerebral deficit in the right temporal area.” To better
    understand the possible “right temporal disturbance,” Dr.
    Walter recommended further neuropsychiatric evaluation to
    seek out possible “abnormal electrical activity.” Dr. Duane
    then conducted an electro-encephalogram and advanced
    brain-mapping.         Dr. Duane summarized Djerf’s
    developmental history, noting that as an infant, Djerf “fell
    over and hit his head with a large knot” and reportedly fell
    often in the subsequent years. Dr. Duane concluded that the
    DJERF V. RYAN                             19
    test results were consistent with a personality disorder, not
    brain dysfunction. Dr. McMahon compiled the results of all
    these findings and conclusions into a final report. Dr.
    McMahon intimated that the test results are consistent with
    an antisocial personality disorder, not a delusional disorder
    or schizophrenia. Dr. McMahon acknowledged that Djerf
    likely has “some learning disabilities that . . . affect his
    ability to organize a situation and make effective decisions,”
    but concluded “there is an absence of a sufficiently severe
    mental defect that it would have precluded his appreciating
    the wrongfulness of his acts, or resulted in an inability to
    conform his behavior to the requirement of the law.”
    Counsel received each report, and, several days after
    receiving Dr. McMahon’s final report, notified the court they
    would not be submitting any expert mental health evidence
    in mitigation.
    The post-conviction judge considered and rejected
    Djerf’s argument that sentencing counsel provided
    ineffective assistance because they failed to adequately
    investigate and develop evidence of “a serious brain-related
    injury” that Djerf experienced as a child. 4 At least two of
    4
    Djerf argues that AEDPA deference does not apply here because
    the post-conviction judge made a factual error. Indeed, the judge
    incorrectly stated that the reports prepared by Dr. McMahon, Dr. Walter,
    and Dr. Duane had been “considered by the court prior to sentencing.”
    Counsel did not submit the reports to the court. However, this minor
    error does not unlock de novo review. See 28 U.S.C. § 2254(d). The
    judge rejected this claim because Djerf failed to show there was helpful
    mental evidence that sentencing counsel could have, but failed to,
    develop. Djerf’s speculation that such evidence might have existed was
    insufficient. Whether the sentencing court reviewed certain reports prior
    to sentencing had no bearing on this holding. De novo review is
    authorized when a “decision . . . was based on an unreasonable
    determination of the facts,” not every time an order or opinion includes
    an incorrect factual finding. 28 U.S.C. § 2254(d) (emphasis added).
    20                     DJERF V. RYAN
    the experts who evaluated Djerf prior to sentencing were
    aware of his alleged childhood head injury. Djerf does not
    specify what further information counsel should have but
    failed to uncover and provide to the experts to assist in their
    evaluations: Djerf’s mother admitted she did not seek
    medical attention for her son, and no other family member
    recalled the injury or any side effects. The McMahon,
    Walter, and Duane reports could reasonably be read to rule
    out schizophrenia or any other comparably mitigating
    disorder. Djerf asked the post-conviction judge to deduce
    from these reports that unidentified background evidence
    would have changed the diagnosis or that other experts,
    equipped with such information, might have diagnosed him
    with schizophrenia. It was not unreasonable for the judge to
    decline the invitation to make this speculative leap. That
    Djerf later found experts who might nominally disagree with
    the earlier findings, see infra p.23–24, does not render the
    state court’s ruling unreasonable, as no evidence establishing
    a diagnosis helpful to the defense was in the state post-
    conviction record. See Murray v. Schriro, 
    745 F.3d 984
    ,
    1000 (9th Cir. 2014) (AEPDA review limited to evidence in
    state court record). Any argument that sentencing counsel
    erred by failing to present reports or testimony from Dr.
    McMahon, Dr. Walter, or Dr. Duane during mitigation is
    equally unavailing. “When counsel focuses on some issues
    to the exclusion of others, there is a strong presumption that
    [they] did so for tactical reasons . . . .” Yarborough v.
    Gentry, 
    540 U.S. 1
    , 8 (2003) (per curiam). Given that many
    aspects of their reports were harmful to Djerf’s mitigation
    case, that presumption remains unrebutted here. For all of
    these reasons, we hold that the post-conviction judge
    DJERF V. RYAN                              21
    reasonably applied Strickland in concluding that sentencing
    counsel did not provide ineffective assistance. 5
    We need not reach the second prong of Strickland, but if
    we did, we would conclude that the sentencing counsel’s
    failure to investigate, develop, and present additional mental
    health evidence was not prejudicial. Again, it is not clear
    what evidence counsel would have uncovered had they more
    vigorously investigated the purported head injury, or that the
    discovery of such evidence would have resulted in expert
    evidence supporting a schizophrenia diagnosis. Such
    speculation rarely creates a “reasonable probability” that a
    different result would have occurred absent the purportedly
    deficient representation. 
    Strickland, 466 U.S. at 694
    . The
    prejudice inquiry also requires consideration of the State’s
    aggravation case, which was remarkably strong: at least
    three aggravating factors applied for each victim, including
    undisputed, vivid details of gruesome physical, sexual, and
    emotional abuse preceding the killings. The post-conviction
    judge reasonably concluded that any deficient performance
    by sentencing counsel was harmless under Strickland.
    5
    Djerf claims that the post-conviction judge never reached the
    question of deficient performance and instead ruled only on prejudice.
    Accordingly, he insists we review Strickland performance de novo. See
    Porter v. McCollum, 
    558 U.S. 30
    , 39 (2009) (per curiam). We disagree;
    read fairly, the judge’s ruling addresses both prongs of the analysis. But
    even if we agreed with Djerf’s take on the ruling, we would reach the
    same ultimate conclusion under de novo review. Counsel conducted a
    “thorough investigation of law and facts relevant to [Djerf’s] plausible
    options” for mitigation, and we must therefore afford significant
    deference to their tactical decisions. Hernandez v. Chappell, 
    923 F.3d 544
    , 550 (9th Cir. 2019) (quoting 
    Strickland, 466 U.S. at 690
    ). Their
    investigation of possible mental health mitigation evidence was not
    unreasonable under prevailing professional norms. 
    Strickland, 466 U.S. at 688
    .
    22                     DJERF V. RYAN
    C. Evidentiary Hearing
    In the district court, Djerf requested an evidentiary
    hearing in connection with his ineffective assistance of
    sentencing counsel claim, and he now seeks a remand to
    permit expansion of the record and reconsideration of this
    claim. The district court denied the request because Djerf
    had not been diligent in developing the proffered factual
    basis in state court. For the following reasons, we affirm.
    Under Cullen v. Pinholster, when a claim is subject to
    AEDPA review, a district court is limited to the record that
    was before the state court that adjudicated the claim on the
    merits. 
    563 U.S. 170
    , 185 (2011). The entirety of the
    ineffective sentencing counsel claim is subject to AEDPA
    deference, so no evidentiary expansion is permitted. Even if
    we granted a remand, Pinholster would prohibit the
    introduction of new evidence.
    However, Pinholster was issued several years after Djerf
    requested and the district court denied an evidentiary
    hearing. Lacking Pinholster’s guidance, the district court
    considered whether Djerf satisfied the exception for
    evidentiary expansion under 28 U.S.C. § 2254(e)(2)(A)(ii),
    which requires that “a factual predicate that could not have
    been previously discovered through the exercise of due
    diligence.” See Dickens v. Ryan, 
    740 F.3d 1302
    , 1321 (9th
    Cir. 2014) (en banc) (expansion of the record is “severely
    restrict[ed]” when lack of diligence prevented factual
    development in post-conviction proceedings). Pinholster
    clarified that this statutory exception applies only to claims
    reviewed de novo; evidentiary expansion is prohibited for a
    claim subject to AEDPA review, regardless of 
    diligence. 563 U.S. at 185
    –86.
    DJERF V. RYAN                       23
    Even if we assume, as the district court did, that Djerf’s
    claim was covered by § 2254(e)(A)(2)—because we
    reviewed the ineffective assistance of sentencing counsel
    claim de novo—we conclude that the district court did not
    abuse its discretion by declining to expand the record. See
    West v. Ryan, 
    608 F.3d 477
    , 484 (9th Cir. 2010) (reviewing
    decision to expand record for abuse of discretion).
    As a threshold matter, Djerf’s request for an evidentiary
    hearing in the initial post-conviction proceedings was not
    sufficient to demonstrate diligence. Cf. Baja v. Ducharme,
    
    187 F.3d 1075
    , 1078–79 (9th Cir. 1999); see also Dowthitt
    v. Johnson, 
    230 F.3d 733
    , 758 (5th Cir. 2000) (“Mere
    requests for evidentiary hearings will not suffice; the
    petitioner must be diligent in pursuing the factual
    development of his claim.”). Moreover, Djerf fails to
    identify any new evidence that he presented to the state court
    in support of that request or any proffer he made to
    demonstrate why an evidentiary hearing at that time would
    have been worthwhile.
    In the district court, Djerf sought a hearing to present
    testimony from his sister, his mother, Simpson, and
    Hanratty. A short declaration from his sister offered a few
    new, minor details about Djerf’s upbringing—e.g., their
    father spanked him as a child—but otherwise only
    corroborated the family background evidence originally
    presented in mitigation. Djerf fails to explain how the
    testimony from the other witnesses would vary meaningfully
    from the family background evidence presented in
    mitigation, or why such evidence could not have been
    procured through the exercise of diligence during the initial
    post-conviction proceedings.
    Djerf also seeks to present testimony from new medical
    experts who will testify in support of his theory that he
    24                     DJERF V. RYAN
    suffered from schizophrenia at the time of his crimes. Djerf
    and post-conviction counsel knew that brain dysfunction and
    schizophrenia had been investigated by sentencing counsel
    and several experts. Yet, despite having an appointed expert
    in the post-conviction proceedings, Djerf did not present any
    new medical, psychological, or neurological evidence at that
    time. Djerf fails to explain why the factual basis for this
    claim would have evaded discovery if he and his post-
    conviction counsel had been diligent. In sum, Djerf did little
    to show that an evidentiary hearing was warranted as to his
    family background or mental health, and the district court
    did not abuse its discretion by refusing to hold one.
    III.   Causal Nexus
    Finally, we turn to Djerf’s claim that the Arizona courts
    impermissibly refused to consider mitigating evidence of his
    difficult family background because it lacked a causal
    connection to his crimes. We focus on the Arizona Supreme
    Court’s de novo review of Djerf’s sentence and consider the
    trial judge’s rulings only to the extent that they were
    “adopted or substantially incorporated” by the higher court.
    
    McKinney, 813 F.3d at 819
    . We have addressed many causal
    nexus appeals in recent years and need not repeat the history
    and nuance of this doctrine, which is extensively detailed in
    other decisions. See, e.g., 
    id. at 811–24.
    In short, the
    Supreme Court has clearly established that a sentencing
    court must consider all mitigating evidence; state law may
    not, for example, impose a threshold requirement that a
    defendant demonstrate a causal connection to the offense.
    See Smith v. Texas, 
    543 U.S. 37
    , 43–49 (2004) (per curiam);
    Tennard v. Dretke, 
    542 U.S. 274
    , 283–88 (2004); Penry v.
    Lynaugh, 
    492 U.S. 302
    , 319–28 (1989), abrogated on other
    grounds by Atkins v. Virginia, 
    536 U.S. 304
    (2002); 
    Eddings, 455 U.S. at 110
    –17; Lockett v. Ohio, 
    438 U.S. 586
    , 597–609
    DJERF V. RYAN                         25
    (1978). Of course, the sentencing court is free to assign little
    weight to mitigating evidence, but such evidence may not be
    stripped of all weight as a matter of law. See Harris v.
    Alabama, 
    513 U.S. 504
    , 512 (1995). However, relief is only
    available when a causal nexus error was prejudicial—that is,
    when it was not harmless. 
    McKinney, 813 F.3d at 821
    –22.
    We assume, without deciding, that the Arizona Supreme
    Court committed a causal nexus error here and move directly
    to the harmlessness inquiry.
    The question is whether the Arizona Supreme Court’s
    refusal to consider Djerf’s family background evidence “had
    substantial and injurious effect or influence in determining”
    his sentence. 
    Id. at 822
    (quoting Brecht v. Abrahamson,
    
    507 U.S. 619
    , 623 (1993)). We review aggravating factors
    proven by the State and other mitigating evidence presented
    to the sentencing court, then we ask whether consideration
    of the improperly ignored evidence “would have had a
    substantial impact on a capital sentencer who was permitted
    to evaluate and give appropriate weight to it.” 
    Id. at 823.
    We conclude here it would not—any error was harmless.
    The State established three aggravating factors for each
    of the victims: Djerf committed each murder expecting
    receipt of something of pecuniary value; the murders were
    committed “in an especially heinous, cruel or depraved
    manner”; and the murders were committed in tandem. Ariz.
    Rev. Stat. § 13-703(F)(5), (6), (8) (1996). Because one of
    the victims was under eighteen, the State established another
    aggravating factor for his murder. 
    Id. § 13-703(F)(9).
    Each
    of these factors is significant, but the undisputed facts
    substantiating the “heinous, cruel, or depraved” finding are
    especially powerful: with clear premeditation and
    preparation, Djerf imposed appalling psychological and
    physical suffering upon four strangers from a single family
    26                     DJERF V. RYAN
    before killing them in cold blood. The State’s aggravation
    case stands out as one of, if not the, strongest we have
    reviewed in recent years.
    On the other hand, Djerf’s mitigation case was, as he
    admits on appeal, quite meager. Djerf was twenty-three
    years old at the time of the crimes, did not resist arrest, was
    mostly well-behaved for the duration of his post-arrest
    detention, and purported to accept responsibility and feel
    remorse for his conduct. The trial judge concluded that
    Djerf’s relative youth was not a mitigating factor because
    there was no indication that he lacked substantial judgment
    or an ability to appreciate the consequences of his actions.
    Djerf’s compliance with arresting officers was likewise not
    mitigating because, by that time, his friends were
    cooperating with the police and he had no other option.
    Subsequent statements by Djerf blaming Albert Luna for the
    crime and indicating that he could envision himself killing
    again undermined his purported acceptance of responsibility
    and remorse. So did the tactical justifications for his guilty
    plea. The trial judge found that Djerf had adjusted to
    confinement since his arrest, but several disciplinary
    infractions kept that factor from warranting leniency. The
    trial judge also concluded that Djerf did not suffer from any
    psychological disorders, noting that he expressly disclaimed
    any such problems. None of these considerations warranted
    leniency.
    On direct appeal, Djerf challenged the court’s findings
    regarding age, remorse, and acceptance of responsibility.
    
    Djerf, 959 P.2d at 1288
    –90. The Arizona Supreme Court
    largely reiterated the trial judge’s reasoning and reached the
    same conclusions, finding that these considerations did not
    warrant leniency. 
    Id. DJERF V.
    RYAN                        27
    That brings us to the evidence of a difficult family
    background—evidence that we assume the Arizona courts
    improperly ignored. Djerf’s mother experienced some
    complications during pregnancy and childbirth. She recalled
    her son falling on his head as a toddler, though Djerf’s father
    does not recall any injuries. Neither parent was especially
    affectionate or doting with their son, and they divorced when
    he was approximately six years old; Djerf maintained
    relationships and alternately lived with each parent in the
    subsequent years. Both parents raised their voice on
    occasion, and the mother’s new husband once pushed Djerf
    up against a wall. However, there is no evidence that Djerf
    experienced physical or emotional abuse throughout his
    childhood. His mother recalled him rarely interacting with
    friends, while his father thought he had “normal”
    relationships until high school. At that point, his father
    thought Djerf became “more of a loner,” although he
    regularly spent time with friends. Djerf’s mother and sister
    insisted that Djerf’s father drank heavily, though Djerf did
    not recall ever seeing him intoxicated. His sister also
    remembered their father as “loving” and a “good provider.”
    She recalled a time from their childhood when Djerf
    handcuffed her, but she did not recall anything else notable
    about the incident. Djerf dropped out of high school, but
    later obtained his diploma.
    We have previously found a causal nexus error to be
    harmless when there is “overwhelming” evidence of
    aggravating circumstances and proffered mitigation
    evidence is “limited” or “relatively minor.” Murray v.
    Schriro, 
    882 F.3d 778
    , 815–16 (9th Cir. 2018); Apelt v.
    Ryan, 
    878 F.3d 800
    , 840 (9th Cir. 2017); Greenway v. Ryan,
    
    866 F.3d 1094
    , 1100 (9th Cir. 2017) (per curiam). That is
    precisely the case here. This is not an instance where
    improperly ignored mitigation evidence addressed
    28                     DJERF V. RYAN
    “sustained, severe childhood abuse” “beyond the
    comprehension and understanding of most people.”
    
    McKinney, 813 F.3d at 823
    . In Poyson v. Ryan, there was
    evidence of repeated physical and emotional childhood
    abuse, sexual assault, coerced alcohol and drug use,
    developmental delays, the sudden death of a close parental
    figure, and severe head injuries resulting in headaches and
    loss of consciousness. 
    879 F.3d 875
    , 892–93 (9th Cir. 2018).
    Despite significant aggravating factors, we concluded that
    exclusion of this “particularly compelling” mitigation
    evidence was prejudicial because it may have persuaded the
    sentencing court to impose a non-capital sentence. 
    Id. The mitigating
    evidence here is categorically less compelling,
    and the aggravating circumstances are more severe.
    This is also not a situation where the evidence was
    objectively “important” and “interlinked” with other
    theories of mitigation, such that improperly excluding that
    evidence deprived all other mitigation evidence of
    persuasive force. See Spreitz v. Ryan, 
    916 F.3d 1262
    , 1279–
    80 (9th Cir. 2019). We do not mean to suggest that Djerf
    experienced an idyllic childhood. Rather, there was no
    evidence of severe abuse, trauma, or other troubling
    experiences that might warrant leniency in light of
    overwhelming aggravating circumstances. We have no
    choice but to conclude that any causal nexus error committed
    by the Arizona Supreme Court was harmless.
    CONCLUSION
    The record fails to establish that Djerf’s pre-trial counsel
    were incompetent or provided constitutionally deficient
    representation. This conclusion defeats Djerf’s challenges
    to his waiver of counsel and guilty pleas, as both claims are
    premised on constitutionally inadequate representation.
    Because there is not a reasonable probability that state post-
    DJERF V. RYAN                             29
    conviction proceedings would have turned out differently if
    Djerf had advanced a pre-trial ineffective assistance of
    counsel claim, we cannot excuse the procedural default of
    that claim. The state court reasonably concluded that
    sentencing counsel was not ineffective, and the district court
    did not abuse its discretion by denying Djerf’s request for an
    evidentiary hearing on that claim. Finally, we conclude any
    causal nexus error during Djerf’s sentencing was harmless.
    AFFIRMED. 6
    6
    After oral argument, the Supreme Court granted certiorari in
    McKinney v. Arizona, No. 18-1109, 
    2019 WL 936074
    (June 10, 2019),
    to address the appropriate procedures for resentencing after a capital
    sentence is vacated in light of a prejudicial Eddings error. Djerf moved
    to stay these proceedings pending resolution of that case. Dkt. 119.
    Because no resentencing is warranted here, the motion is DENIED.