People v. Brown ( 2023 )


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  •         IN THE SUPREME COURT OF
    CALIFORNIA
    THE PEOPLE,
    Plaintiff and Respondent,
    v.
    HEATHER ROSE BROWN,
    Defendant and Appellant.
    S257631
    Third Appellate District
    C085998
    Shasta County Superior Court
    15F2440
    March 2, 2023
    Justice Groban authored the opinion of the Court, in which
    Chief Justice Guerrero and Justices Corrigan, Liu, Kruger,
    Jenkins, and Cantil-Sakauye* concurred.
    *
    Retired Chief Justice of California, assigned by the Chief
    Justice pursuant to article VI, section 6 of the California
    Constitution.
    PEOPLE v. BROWN
    S257631
    Opinion of the Court by Groban, J.
    Defendant Heather Rose Brown gave birth to a baby girl in a
    hotel room. In the fifth day of her life, while lying face down
    between her sleeping parents who were both under the influence of
    heroin, Brown’s newborn daughter stopped breathing. When
    Brown woke and noticed, she directed her daughter’s father to call
    911.    Brown administered CPR, following the dispatcher’s
    instructions, until the ambulance arrived. Further efforts to
    resuscitate Brown’s daughter were unsuccessful. An autopsy
    revealed traces of heroin-derived morphine and methamphetamine
    in the baby’s body fluids and the contents of her stomach.
    The District Attorney charged Brown with first degree
    murder and prosecuted the charge on the theory that Brown had
    poisoned her newborn daughter by feeding her breast milk after
    smoking heroin and methamphetamine. The trial court instructed
    the jurors that to convict Brown of first degree murder they had to
    find she committed “an act” with the mental state of malice
    aforethought that was a substantial factor in causing her baby’s
    death and that she “murdered by using poison.” The instructions
    did not require the jury to find that Brown acted with any
    particular, heightened mental state when she fed her baby her
    breast milk. They thus allowed the jury to convict Brown of first
    degree murder if it found that she acted with malice — a mental
    state that normally would only support a conviction of second
    degree murder — and that poison was a substantial factor in
    causing her baby’s death. Based on these instructions, the jury
    1
    PEOPLE v. BROWN
    Opinion of the Court by Groban, J.
    convicted Brown of the first degree murder of her newborn
    daughter, for which the court imposed a sentence of 25 years to life
    in prison.
    Brown argues that the jury instructions were incomplete
    because they did not require the jury to find she fed her daughter
    her breast milk with a mental state equivalent in turpitude to the
    willfulness, deliberation, and premeditation that generally
    distinguishes first degree murder from second degree murder. The
    Attorney General argues that the instructions were complete,
    because, in his view, proof that a defendant used poison is sufficient
    to elevate a murder to the first degree, without any proof of mental
    state beyond the showing of malice required for all murder
    convictions. We conclude Brown has the better argument.
    When dividing the common law offense of murder into two
    degrees, the Legislature reserved for the first degree types of
    murders that are “cruel and aggravated” and thus “deserving of
    greater punishment” than other malicious or intentional killings,
    which are punishable only as second degree murder. (People v.
    Sanchez (1864) 
    24 Cal. 17
    , 29 (Sanchez).) From the beginning,
    those murders have included all murder “perpetrated by means of
    poison, or lying in wait, torture, or by any other kind of wilful,
    deliberate and premeditated killing.” (1 Hittell’s Cal. Gen. Laws
    from 1850 to 1864, par. 1425, § 21 (1872) (Hittell’s); id. at par. 1423,
    § 19.)
    We previously have interpreted this language to require proof
    of a mental state more culpable than the malice required for second
    degree murder, in keeping with the Legislature’s determination
    that murders perpetrated by these means warrant the greater
    punishment reserved for first degree murder. For torture murder,
    the prosecution must show “wilful, deliberate and premeditated
    2
    PEOPLE v. BROWN
    Opinion of the Court by Groban, J.
    intent to inflict extreme and prolonged pain.” (People v. Steger
    (1976) 
    16 Cal.3d 539
    , 546 (Steger).) For lying in wait murder, the
    prosecution must show the defendant performed the acts of
    watching, waiting, and concealment with the intent to take the
    victim by surprise to facilitate the infliction of injury likely to cause
    death. (People v. Webster (1991) 
    54 Cal.3d 411
    , 448 (Webster);
    People v. Gutierrez (2002) 
    28 Cal.4th 1083
    , 1149, fn. 10 (Gutierrez).)
    However, since in a typical first degree murder by poison case there
    is no question that the defendant acted with willfulness,
    deliberation, and premeditation, we have never addressed whether
    there is a mental state component of first degree poison murder.
    We now clarify that to prove first degree murder by means of
    poison, the prosecution must show the defendant deliberately gave
    the victim poison with the intent to kill the victim or inflict injury
    likely to cause death.
    The trial court’s instructions did not include this element of
    first degree poison murder. This was error. And because a rational
    jury could have concluded the prosecution did not prove beyond a
    reasonable doubt that Brown deliberately gave her newborn
    daughter the poisonous substances in her breast milk with the
    intent to kill her or inflict injury likely to cause her death, the error
    was prejudicial. Accordingly, we reverse Brown’s first degree
    murder conviction.
    I. BACKGROUND
    A. Trial Court Proceedings
    1. Evidence of Events Leading to Baby’s Death
    In a recorded interview played for the jury, Brown told a
    police investigator she met her husband, Daylon Reed, when she
    was twenty years old. Reed dealt and used drugs, including
    marijuana, methamphetamine, and heroin, and soon after meeting
    3
    PEOPLE v. BROWN
    Opinion of the Court by Groban, J.
    him, Brown began to use heroin. A few months into their
    relationship, Brown learned she was pregnant. Brown continued
    to use heroin during her pregnancy and occasionally also used
    methamphetamine.
    Brown had almost no prenatal care and she and Reed made
    no arrangements for their baby’s birth. When Brown went into
    labor, the couple got a hotel room and Brown called a friend and
    asked her to find a midwife. Brown’s friend called a friend of hers,
    a doula who had assisted a midwife with some deliveries, who
    agreed to attend the birth. Brown smoked heroin while in labor,
    believing it would help with the pain, hiding that she was doing so
    from the doula and her mother, who also was present for the birth,
    by smoking in the bathroom.
    At trial, several witnesses testified that Brown said she did
    not want to give birth in a hospital because she was afraid that if
    she tested positive for drugs the baby would be taken away. Reed’s
    sister Michelle testified that she had given birth to a baby boy at a
    local hospital not long after meeting Brown. The baby experienced
    withdrawal, Child and Family Services became involved, and
    Michelle voluntarily relinquished custody.
    Brown’s daughter, Dae-Lynn Rose, appeared healthy at
    birth, but a couple days later began to appear ill. The doula,
    Brown’s mother, and Brown’s father and stepmother all advised
    Brown and Reed to take the baby to a doctor, but they did not do
    so. Brown admitted to the police investigator that she believed that
    if she gave birth at the hospital or took her baby to a doctor, her
    baby would be taken from her. Nevertheless, Brown said she had
    been planning to take Dae-Lynn to a doctor on the day she died.
    Brown also admitted that after Dae-Lynn’s birth, she and
    Reed smoked heroin almost every day. She said they smoked in
    4
    PEOPLE v. BROWN
    Opinion of the Court by Groban, J.
    the bathroom so the baby would not inhale it. When confronted,
    she admitted that she also smoked methamphetamine once during
    her daughter’s life.
    Brown fed Dae-Lynn both breast milk and infant formula.
    When Dae-Lynn was two days old, Brown searched for information
    on the internet about how to help newborns suffering from
    withdrawal. She told the police investigator she continued to feed
    Dae-Lynn breast milk because she had read on the internet that
    when “babies were withdrawing” breast milk is “supposed to help
    ease ’em.” When the investigator asked Brown whether she
    supplemented her breast milk with formula because she was afraid
    that the heroin she was using would pass into her breast milk,
    Brown responded, “Yes, and it wasn’t just that. It was also the lack
    of milk that I was producing.” When the investigator suggested to
    Brown that perhaps she had intentionally passed drugs to Dae-
    Lynn in her breast milk to try to alleviate her withdrawal
    symptoms, Brown responded, “I never had that thought even come
    across my mind.”
    2. Evidence Related to Baby’s Death
    Dae-Lynn died in the fifth day of her life. In the early
    morning hours, Brown and Reed smoked heroin. Later, Brown fed
    Dae-Lynn a couple of times, giving her breast milk and infant
    formula. Mid-morning, Brown fell asleep, putting the baby face
    down between her and Reed on the hotel room bed. Dae-Lynn woke
    up again once, crying, and Brown repositioned her so she was lying
    next to Brown, under Brown’s arm. Around noon, a housekeeper
    woke Brown and Reed and told them they needed to go to the office
    and pay if they were planning to stay another night, but they fell
    5
    PEOPLE v. BROWN
    Opinion of the Court by Groban, J.
    back asleep without paying. Before falling asleep, Brown looked at
    Dae-Lynn, who was breathing normally.
    Around 1:00 p.m., hotel management woke Brown and Reed,
    telling them they had to leave unless they paid for another night.
    Brown went to the door to pay, then checked on Dae-Lynn. Though
    the baby’s body was warm, she was not breathing. Brown told Reed
    to call 911. The dispatcher sent an ambulance and instructed
    Brown over the phone on how to administer CPR, which she did
    until paramedics arrived. Shortly after arriving at the hospital,
    Dae-Lynn was pronounced dead.
    When the police investigator asked Brown later that day
    what she thought caused Dae-Lynn’s death, she said she thought
    maybe she had accidentally suffocated her daughter in her sleep.
    When he asked her whether she suffocated Dae-Lynn on purpose,
    she denied any intent to harm her daughter and expressed her love
    for Dae-Lynn and excitement about being a mom. When the police
    investigator told Brown six months later, at the time of her arrest,
    that the autopsy report said her baby had died from exposure to
    methamphetamine and heroin, Brown responded: “[T]hat . . . kills
    me because I was only trying to help her. I didn’t wanna try to
    harm my daughter at all. I never would intentionally.”1
    3. Jury Instructions
    The trial court instructed the jury that to find Brown guilty
    of murder, it must find she intentionally committed a prohibited
    act or intentionally failed to perform a required act “with a specific
    1
    The prosecutor put on several witnesses to testify about
    potential causes of Dae-Lynn’s death. Brown raised a challenge to
    the sufficiency of the evidence that Dae-Lynn’s death was caused
    by poison, which the Court of Appeal rejected. This issue is not
    before us, and we express no view on it.
    6
    PEOPLE v. BROWN
    Opinion of the Court by Groban, J.
    intent and/or mental state” that would be explained in the murder
    instruction. In the murder instruction, the court explained that to
    convict Brown of murder in the first or second degree, the jury had
    to find that she committed “an act” that was a substantial factor in
    causing the victim’s death with the mental state of malice
    aforethought. As to the act requirement, the court further
    instructed that a parent’s “failure to act” in accordance with the
    duty to “provide care, obtain medical attention and protect a child
    . . . is the same as doing any . . . injurious act.” As to the mental
    state requirement, the court explained that malice can be either
    express, meaning the defendant “unlawfully intended to kill,” or
    implied, meaning that: (1) “she intentionally committed an act,” (2)
    “the natural and probable consequences of the act were dangerous
    to human life,” (3) “[a]t the time she acted, she knew her act was
    dangerous to human life,” and (4) “she deliberately acted with
    conscious disregard for human life.”           The court elaborated:
    “[M]alice aforethought does not require hatred or ill will toward the
    victim. . . . It does not require deliberation or the passage of any
    period of time.”
    On the degree of murder, the trial court explained: “If you
    decide the defendant committed murder, it is murder of the second
    degree, unless the People have proved beyond a reasonable doubt
    that it is murder of the first degree . . . .” The trial court then
    instructed the jury on the additional finding it would have to make
    to convict Brown of first degree murder: “The defendant is guilty
    of first degree murder if the People have proved that the defendant
    murdered by using poison. Poison is a substance applied externally
    to the body or introduced into the body that can kill by its own
    inherent qualities.” The court did not instruct the jury that it
    needed to find that Brown had any particular, heightened mental
    7
    PEOPLE v. BROWN
    Opinion of the Court by Groban, J.
    state in giving the poison to the victim to find her guilty of murder
    in the first degree rather than in the second degree.
    4. Verdict and Sentencing
    The jury convicted Brown of the first degree murder by poison
    of Dae-Lynn, among other offenses not at issue. The trial court
    imposed a sentence of 25 years to life for that count.
    B. Court of Appeal Proceedings
    On appeal, Brown contended that the jury instruction on first
    degree poison murder was incomplete because it did not inform the
    jury that the defendant must administer the poison willfully,
    deliberately, and with premeditation. In an unpublished opinion,
    the Court of Appeal rejected this argument, concluding: “[I]t
    appears the People need only prove that the killing was caused by
    administration of poison, and that the killing was done with malice.
    Such a killing is first degree murder as a matter of law.” 2
    II. DISCUSSION
    We granted review to determine whether, to prove first
    degree murder by poison, it is enough for the prosecution to show
    the defendant’s use of poison was a substantial factor in causing
    the victim’s death, or whether instead the prosecution must show
    the defendant acted with a particular mental state when using the
    poison, separate from the showing of malice that would support a
    conviction of second degree murder. We also agreed to decide
    2
    We are not aware of any other case, and the Attorney General
    has cited none, in which an appellate court in this country has
    upheld a first degree murder conviction of a drug-addicted mother
    whose baby died after drinking breast milk containing controlled
    substances the mother had consumed.
    8
    PEOPLE v. BROWN
    Opinion of the Court by Groban, J.
    whether reversal of Brown’s first degree murder conviction would
    be required if we concluded the trial court erred in failing to
    instruct on the mental state required for first degree poison
    murder. For the reasons discussed below, we hold that to elevate
    a murder to the first degree, it is not enough for the prosecution to
    prove the use of poison was a substantial cause of the victim’s
    death; instead, the prosecution must prove the defendant
    deliberately gave the victim poison with the intent to kill the victim
    or inflict injury likely to cause the victim’s death. Because we
    cannot conclude beyond a reasonable doubt that the jury would
    have found Brown guilty of first degree murder had it been so
    instructed, we reverse the judgment of the Court of Appeal.
    A. Instructional Error
    A trial court must instruct on each element of a charged
    offense, even when the defendant does not propose a complete
    instruction or object to the court’s failure to provide one. (People v.
    Merritt (2017) 
    2 Cal.5th 819
    , 824.) In this case, the trial court did
    not instruct the jurors that they were required to find Brown had
    used the poison with any particular, heightened mental state to
    convict her of murder in the first degree. Rather, its instruction on
    the degree of murder permitted the jurors to find Brown guilty of
    first degree murder if they found that she committed murder and
    the use of poison was a substantial factor in causing her daughter’s
    death. Under these instructions, second degree implied malice
    murder became first degree murder based on the act of using poison
    alone; the jury was not required to find that Brown acted with a
    more culpable mental state when feeding her daughter her breast
    milk.
    To determine whether the trial court erred in failing to instruct
    on the mental state element of first degree murder by poison, we
    9
    PEOPLE v. BROWN
    Opinion of the Court by Groban, J.
    must first determine whether there is such an element. Brown
    argues a poison murder is only in the first degree if the killer
    poisoned the victim on purpose, with the calculated deliberation
    and cold-blooded intent that renders first degree murder more
    deplorable than second degree murder, and that the trial court’s
    failure to instruct on this mental state was error. The Attorney
    General disagrees, arguing that no instruction on the mental state
    specific to the act of poisoning was required because all murders by
    means of poison are categorically murders in the first degree. In
    the Attorney General’s view, the act of using poison suffices to
    elevate an implied malice murder to the first degree.
    1. Language, Context, and History of Penal Code
    Section 189
    To resolve this dispute, we begin with an examination of the
    statutory language in its historical context. Penal Code section 187
    defines “murder” as “the unlawful killing of a human being . . . with
    malice aforethought.” (Id., subd. (a).)3 Section 189 describes the
    two degrees of murder, defining first degree murder to include, in
    relevant part, “[a]ll murder that is perpetrated by means of a
    destructive device or explosive, a weapon of mass destruction,
    knowing use of ammunition designed primarily to penetrate metal
    or armor, poison, lying in wait, torture, or by any other kind of
    willful, deliberate, and premeditated killing . . . .” (§ 189, subd.
    (a).) Second degree murder is defined by exclusion: All murder
    that is not first degree murder is “of the second degree.” (Id. subd.
    (b).)
    3
    All further undesignated statutory references are to the
    Penal Code.
    10
    PEOPLE v. BROWN
    Opinion of the Court by Groban, J.
    This division of murder into two degrees — and the
    designation of murders by means of poison, lying in wait, and
    torture as kinds of first degree premeditated murder — has been
    part of California law since before the adoption of the Penal Code.
    California’s first murder statute, enacted in 1850, defined murder
    as “the unlawful killing of a human being, with malice
    aforethought, either express or implied” and provided only one
    penalty for murder: death. (Garfielde & Snyder Compiled Cal.
    Laws, § 19 (1853); id., § 21.) In 1856, the Legislature amended the
    statute to designate two degrees of murder. (Stats. 1856, ch. 139,
    § 1, p. 219; People v. Wiley (1976) 
    18 Cal.3d 162
    , 168 (Wiley).)
    Death remained the only punishment for first degree murder;
    second degree murder was punishable by a term of imprisonment
    “not less than ten years and which may extend to life.” (Hittell’s,
    
    supra,
     par. 1425, § 21; Wiley, at p. 168.) As part of the 1856
    amendment, the Legislature designated as first degree murders
    those “perpetrated by means of poison, or lying in wait, torture, or
    by any other kind of wilful, deliberate and premeditated killing.”
    (Hittell’s, 
    supra,
     par. 1425, § 21.) When the Legislature adopted
    the Penal Code in 1872, it carried over this division between first
    degree murder and second degree murder into section 189.
    Although other kinds of “willful, deliberate, and premeditated”
    killing have been added to section 189 since its enactment, the
    relevant language — “[a]ll murder which is perpetrated by means
    of poison, or lying in wait, torture, or by any other kind of willful,
    deliberate, and premeditated killing . . . is murder of the first
    degree. . . ” — remains substantially unchanged to this day. (1872
    Pen. Code, § 189.)
    11
    PEOPLE v. BROWN
    Opinion of the Court by Groban, J.
    Explaining the Legislature’s intent in enacting section 189,
    the California Code Commission 4 noted that the division of murder
    into two degrees was based on the “manifest injustice” of inflicting
    the death penalty in cases involving killings that “differed greatly
    from each other in the degree of atrociousness.” (Code commrs.,
    note foll., Ann. Pen. Code, § 189 (1st ed. 1872, Haymond & Burch,
    commrs.-annotators) p. 82.) The Commission’s notes quote with
    approval our 1864 opinion in Sanchez, supra, 
    24 Cal. 17
    , in which
    we described the Legislature’s basis for distinguishing the two
    degrees of murder as follows: “In order to constitute murder of the
    first degree there must be something more than a malicious or
    intentional killing. . . . [¶] In dividing murder into two degrees, the
    Legislature intended to assign to the first, as deserving of greater
    punishment, all murders of a cruel and aggravated character; and
    to the second all other kinds of murder which are murder at
    common law; and to establish a test by which the degree of every
    case of murder may be readily ascertained. That test may be thus
    stated: Is the killing wilful, (that is to say, intentional,) deliberate,
    and premeditated? If it is, the case falls within the first, and if not,
    within the second degree.” (Id. at pp. 28–29; see code commrs., note
    foll., Ann. Pen. Code, § 189, supra, at pp. 82–83.) As to murders by
    poison, lying in wait, and torture, we observed that the Legislature
    considered the means used to “carry with them conclusive evidence
    of premeditation”5 because these means of killing, by their nature,
    4
    In construing the Penal Code of 1872, the Code
    Commissioners’ notes are entitled to substantial weight because
    the commissioners drafted the code. (Keeler v. Superior Court
    (1970) 
    2 Cal.3d 619
    , 630.)
    5
    In later cases, we moved away from the concept of
    “conclusive” proof, referring instead to proof of murder by means of
    12
    PEOPLE v. BROWN
    Opinion of the Court by Groban, J.
    involve “the deliberate and preconceived intent to kill.” (Sanchez,
    at pp. 29–30.)
    This history shows the Legislature specified that “[a]ll murder
    that is perpetrated by means of . . . poison, lying in wait, [or]
    torture . . . is murder of the first degree” because it considered such
    murders to be kinds of “willful, deliberate, and premeditated
    killing,” and as such deserving of the greater punishment reserved
    for first degree murders, which at the time of section 189’s
    enactment was death. (§ 189, subd. (a); see People v. Milton (1904)
    
    145 Cal. 169
    , 170 (Milton) [the means of poison, lying in wait, and
    torture “furnish evidence of willfulness, deliberation, and
    premeditation” because the statute designates these means as
    kinds of “willful, deliberate, and premeditated killing”].) In
    designating murders carried out by these means as first degree
    murder, the Legislature intended to require “something more” than
    the showing of a malicious or intentional killing required for second
    degree murder — something equivalent in turpitude to willfulness,
    deliberation, and premeditation. (Sanchez, supra, 24 Cal. at p. 28;
    id. at p. 29.)6
    poison, lying in wait, or torture as “the functional equivalent of
    proof of premeditation, deliberation and intent to kill” (People v.
    Ruiz (1988) 
    44 Cal.3d 589
    , 614 (Ruiz)), and observing that a
    showing of murder by one of these means “obviates the necessity of
    separately proving premeditation and deliberation . . . .” (People v.
    Hardy (1992) 
    2 Cal.4th 86
    , 162.)
    6
    As noted, murder by means of poison, lying in wait, and
    torture all appeared in the statute at its inception. (Pt. II.A.1, ante,
    at pp. 11–12.) We express no opinion on other categories of first
    degree murder that the Legislature subsequently added to section
    189.
    13
    PEOPLE v. BROWN
    Opinion of the Court by Groban, J.
    2. First Degree Murder by Torture, Lying in Wait, and
    Other Means
    While an examination of the language of section 189 in its
    historical context reveals the Legislature’s intent to require proof
    of “something more” than malice to elevate a murder by means of
    torture, lying in wait, or poison to the first degree, it reveals little
    about what that “something more” might be. (Sanchez, supra,
    24 Cal. at p. 28.) For that, we turn to our case law. We have never
    been asked to directly address what mental state in the
    administration of poison is required to elevate a poison murder to
    the first degree. We have, however, addressed this question in the
    contexts of murder by torture and by lying in wait — the two other
    kinds of “willful, deliberate, and premeditated killing” that section
    189 has listed as categorically “murder of the first degree” since its
    enactment. In both contexts, we have concluded that more than
    malice is required; the defendant must have committed the
    designated act with a specific mental state that is equivalent to
    willfulness, deliberation, and premeditation.
    We discussed the mental state component of murder by
    means of torture in People v. Heslen (1945) 
    163 P.2d 21
     (Heslen),
    concluding that “the requirement of an intent to cause pain and
    suffering” is implicit in the word “torture.” (Id. at p. 27.) Later, in
    People v. Tubby (1949) 
    34 Cal.2d 72
    , we emphasized that “[t]he
    dictionary definition [of torture] was appropriately enlarged upon
    by this court” in Heslen to include “intent . . . to cause cruel
    suffering.” (Tubby, at pp. 76–77.) We further elaborated on this
    definition in Steger, supra, 16 Cal.3d at page 546, explaining that
    first degree “murder by means of torture” is “murder committed
    with a wilful, deliberate, and premeditated intent to inflict extreme
    and prolonged pain.” We reasoned: “In labeling torture as a ‘kind’
    of premeditated killing, the Legislature requires the same proof of
    14
    PEOPLE v. BROWN
    Opinion of the Court by Groban, J.
    deliberation and premeditation for first degree torture murder that
    it does for other types of first degree murder.” (Ibid.) We went on
    to explain: “It is not the amount of pain inflicted which
    distinguishes a torturer from another murderer, as most killings
    involve significant pain. [Citation.] Rather, it is the state of mind
    of the torturer — the cold-blooded intent to inflict pain for personal
    gain or satisfaction — which society condemns. Such a crime is
    more susceptible to the deterrence of first degree murder sanctions
    and comparatively more deplorable than lesser categories of
    murder.” (Ibid.) Our holding in Steger thus rested on the premise
    that the requirement that the defendant have a mental state of
    “wilful, deliberate, and premeditated intent to inflict extreme and
    prolonged pain” was necessary to preserve the distinction between
    calculated, deliberate murder, which is murder in the first degree,
    and other types of intentional or malicious killing, which are second
    degree murder. (Id. at p. 546; id. at pp. 544–546 & fn. 2; see Wiley,
    supra, 18 Cal.3rd at p. 168 [torture designated as first degree
    murder in part because “the calculated nature of the acts causing
    death” make torture particularly reprehensible]; People v. Cole
    (2004) 
    33 Cal.4th 1158
    , 1227 [same].)
    In People v. Tuthill (1947) 
    31 Cal.2d 92
    , we addressed the
    mental state question in the context of first degree murder by lying
    in wait. We began by noting the need for interpretation of the
    statutory language before declaring that a “literal[]” understanding
    of the term lying in wait includes “[t]he elements of waiting,
    watching, and secrecy.” (Id. at p. 101; id. at p. 100.) Elaborating
    on this understanding, we since have established that “it is not
    sufficient to merely show the elements of waiting, watching and
    concealment. It must also be shown that the defendant did those
    physical acts with the intent to take [the] victim unawares and for
    the purpose of facilitating [the] attack.” (People v. Mattison (1971)
    15
    PEOPLE v. BROWN
    Opinion of the Court by Groban, J.
    
    4 Cal.3d 177
    , 183 (Mattison); see Webster, 
    supra,
     54 Cal.3d at
    p. 448 [“The concealment required for lying in wait ‘is that which
    puts the defendant in a position of advantage, from which the
    factfinder can infer that lying-in-wait was part of the defendant’s
    plan to take the victim by surprise’ ”]; People v. Laws (1993)
    
    12 Cal.App.4th 786
    , 795 (Laws) [lying in wait involves the “intent
    to watch and wait for the purpose of gaining advantage and taking
    the victim unawares in order to facilitate the act which constitutes
    murder”].) We have also established that the defendant must act
    with a “ ‘wanton and reckless intent to inflict injury likely to cause
    death,’ ” (Gutierrez, 
    supra,
     28 Cal.4th at p. 1148), and the period of
    lying in wait must be sufficient to show that the defendant had
    “ ‘ “a state of mind equivalent to premeditation or deliberation” ’ ”
    (People v. Stevens (2007) 
    41 Cal.4th 182
    , 202). Only upon these
    specific showings of the defendant’s mental state in lying in wait
    do we consider the defendant to have acted with “the functional
    equivalent of” a premeditated, deliberate intent to kill (People v.
    Stanley (1995) 
    10 Cal. 4th 764
    , 794 (Stanley)), such that “no further
    evidence of premeditation and deliberation is required in order to
    convict the defendant of first degree murder” (People v. Sandoval
    (2015) 
    62 Cal.4th 394
    , 416).
    Thus, in both the torture-murder context and the lying-in-wait
    context, we have given content to the bare statutory requirement
    that a first degree murder be “perpetrated by means of . . . poison,
    lying in wait, torture, or by any other kind of willful, deliberate,
    and premeditated killing.” (§ 189, subd. (a).) At the same time, we
    have emphasized that separate proof of premeditated intent to kill
    is not required in either context. (See Gutierrez, 
    supra,
     28 Cal.4th
    at p. 1149 [lying in wait special circumstance requires “ ‘an
    intentional murder,’ ” whereas first degree murder requires “ ‘only
    a wanton and reckless intent to inflict injury likely to cause
    16
    PEOPLE v. BROWN
    Opinion of the Court by Groban, J.
    death’ ”]; People v. Davenport (1985) 
    41 Cal.3d 247
    , 271
    (Davenport) [special circumstance can be “distinguished from
    murder by torture under section 189” because for the torture-
    murder special circumstance “the defendant must have acted with
    the intent to kill”].) Our narrow constructions of “torture” and
    “lying in wait” effectuate the Legislature’s understanding that a
    murder by these means involves, by its nature, a mental state more
    “cruel and aggravated” than malice — a mental state equivalent in
    turpitude to willfulness, deliberation, and premeditation — but
    that it need not involve the premeditated intent to kill. (Sanchez,
    supra, 24 Cal. at p. 29; Steger, supra, 16 Cal.3d at p. 546, fn. 2;
    Laws, supra, 12 Cal.App.4th at p. 795.)
    3. First Degree Murder by Means of Poison
    This case brings to light the need for us to elaborate on the
    meaning of the phrase “murder . . . perpetrated by means of . . .
    poison,” just as prior cases have required us to elaborate on the
    meanings of “torture” and “lying in wait.” (§ 189, subd. (a).) Since
    first degree murder by poison shares a legislative history and
    purpose with first degree murder by lying in wait and by torture,
    it would be incongruous not to read a similar state of mind
    requirement — one equivalent in turpitude to willful, deliberate,
    premeditated intent to kill — into first degree poison murder.
    Latent ambiguity in the term “poison,” as in the terms “torture”
    and “lying in wait,” further suggests the need to clarify the mental
    state requirement. The standard instruction the trial court gave
    in this case defines poison as “a substance, applied externally to
    the body or introduced into the body, that can kill by its own
    inherent qualities.” (CALCRIM No. 521.) But the use of a
    substance that is inherently capable of killing does not in and of
    itself render a murder particularly reprehensible. (Cf. People v.
    Watson (1981) 
    30 Cal.3d 290
    , 296–297 [vehicular homicide with
    17
    PEOPLE v. BROWN
    Opinion of the Court by Groban, J.
    implied malice is second degree murder].) And many poisonous
    substances can be used to help people in the correct quantities,
    circumstances, and applications. (See, e.g., People v. Archerd
    (1970) 
    3 Cal.3d 615
     (Archerd) [insulin]; People v. Jennings (2010)
    
    50 Cal.4th 616
     (Jennings) [sedatives].) Indeed, as one court has
    observed, “[a] fundamental tenet of toxicology is that the ‘dose
    makes the poison’ and that all chemical agents, including water,
    are harmful if consumed in large quantities, while even the most
    toxic substances are harmless in minute quantities.” (Mancuso v.
    Consolidated Edison Co. of New York (S.D.N.Y. 1999) 
    56 F.Supp.2d 391
    , 403.) The knowing administration of a substance capable of
    causing death — even under conditions demonstrating a conscious
    disregard of that risk — does not show a state of mind equivalent
    to “willful, deliberate, and premeditated killing.” (§ 189, subd. (a).)
    The Attorney General attempts to distinguish poison murder
    from murder by torture and lying in wait by arguing that poison is
    more closely analogous to the additional means of murder the
    Legislature designated as first degree murder after the Penal
    Code’s enactment: murders by means of “destructive device or
    explosive, a weapon of mass destruction, [or] knowing use of
    ammunition designed primarily to penetrate metal or armor.” He
    argues that torture and lying in wait are “methods” of murder,
    while poison (like a weapon of mass destruction) is a “mechanism”
    by which a murder may be committed. This argument ignores the
    plain language of section 189, which does not distinguish between
    “methods” and “mechanisms,” but instead lists torture and lying in
    wait alongside poison as “means” of first degree murder. It also
    ignores the legislative history of section 189, which originally listed
    poison, lying in wait, and torture as the three “means” of murder
    that are prototypical kinds of “wilful, deliberate, and premeditated”
    killing. (Sanchez, supra, 24 Cal. at p. 28; id. at pp. 29–30.)
    18
    PEOPLE v. BROWN
    Opinion of the Court by Groban, J.
    Regardless of whether proof of the defendant’s mental state is
    required to elevate to the first degree a murder by means of
    destructive device, explosive, weapon of mass destruction, or
    armor-piercing ammunition — a question we do not reach in this
    case — their subsequent addition to section 189 does not provide a
    basis for distinguishing poison from lying in wait and torture with
    respect to the required mental state.
    That the Legislature would consider poison murder — like
    murder by lying in wait or torture — to be a kind of “wilful,
    deliberate, and premeditated” killing (Hittell’s, supra, par. 1425, §
    21) makes sense when we think of the typical poison murder, in
    which the defendant intentionally and surreptitiously administers
    a deadly dose of poison to an unsuspecting victim. The poison
    murder cases we have decided to date generally follow this pattern.
    In People v. Albertson (1944) 
    23 Cal.2d 550
     (Albertson), the
    defendant was accused of putting cyanide in vitamin capsules and
    mailing them to the victim with a letter advertising them as
    “ ‘ “vitalizing vitamin vigor.” ’ ” (Id. at p. 559; id. at p. 563.) In
    Archerd, supra, 
    3 Cal.3d 615
    , the defendant injected two of his
    wives and his nephew with massive doses of insulin, causing
    diabetic shock. (Id. at pp. 625–626, 631–635.) In People v. Diaz
    (1992) 
    3 Cal.4th 495
     (Diaz), a nurse murdered 12 intensive care
    unit patients by injecting them with overdoses of lidocaine. (Id. at
    pp. 517–518, 538.) In People v. Catlin (2001) 
    26 Cal.4th 81
     (Catlin),
    the defendant murdered his wife and mother by giving them the
    highly toxic weed-killer paraquat. (Id. at pp. 99–103.) And in
    People v. Blair (2005) 
    36 Cal.4th 686
     (Blair), the defendant
    murdered his drinking companion by putting cyanide in a bottle of
    gin, carefully replacing the cap so the bottle appeared unopened,
    and having the bottle delivered to the victim by a mutual friend.
    (Id. at pp. 745–746.)
    19
    PEOPLE v. BROWN
    Opinion of the Court by Groban, J.
    Court of Appeal cases likewise follow this pattern. In People v.
    Botkin (1908) 
    9 Cal.App. 244
    , the defendant murdered her lover’s
    wife by sending her a box of candy containing arsenic “with intent
    that [she] should eat thereof and be killed thereby.” (Id. at p. 249.)
    In People v. Potigian (1924) 
    69 Cal.App. 257
    , the defendant gave
    arsenic to her stepdaughter “with intent to bring about her death.”
    (Id. at p. 264.) And in People v. Cobler (1934) 
    2 Cal.App.2d 375
    (Cobler), the defendant murdered her husband by slipping
    strychnine into a glass of milk and giving it to him to drink with
    his breakfast. (Id. at pp. 377–379.)
    In each of these cases, the way the defendant carried out the
    poisoning left no question that the defendant deliberately gave the
    victim poison, if not with the intent to kill, at least with the intent
    to inflict injury likely to cause the victim’s death. Perhaps for this
    reason, none of these cases directly addresses whether the
    prosecution must prove the defendant had a specific, heightened
    mental state in giving the victim the poison to elevate a poison
    murder to the first degree, and if so, what mental state the
    prosecution must prove. Our case law does, however, provide some
    guidance on these questions.
    In Mattison, supra, 4 Cal.3d at pages 184–186, we addressed
    the distinction between second degree felony murder based on
    felony poisoning in violation of section 3477 and first degree poison
    murder, of which the jury had acquitted the defendant. The
    7
    Mattison predated Senate Bill No. 1437 (2017–2018 Reg.
    Sess.), which amended section 188 to provide that except in the
    case of first degree felony murder, “in order to be convicted of
    murder, a principal in a crime shall act with malice aforethought.
    Malice shall not be imputed to a person based solely on his or her
    participation in a crime.” (§ 188, subd. (a)(3); Senate Bill No. 1437
    (2017–2018 Reg. Sess.) § 2; Stats. 2018, c. 1015.)
    20
    PEOPLE v. BROWN
    Opinion of the Court by Groban, J.
    defendant argued that second degree poison murder is “legally
    impossible” because all murders in which poison caused the death
    are in the first degree. (Mattison, at p. 180; id. at pp. 181–182.) We
    rejected this argument, concluding that a jury could have properly
    found the defendant guilty of second degree felony murder by
    means of poison. (Id. at p. 182.) We reasoned that the difference
    between first degree murder by poison and second degree felony
    murder in violation of section 347 — which prohibits poisoning
    food, drinks, and medicine — is the state of mind with which the
    defendant gave the victim the poison. (Mattison, supra, 4 Cal.3d
    at p. 186.) At the time, section 347 required the prosecution to
    prove that the defendant “ ‘willfully mingle[d] any poison with any
    food, drink or medicine, with intent that the same shall be taken
    by any human being to his injury . . . .’ ” (Mattison, at p. 184,
    quoting Pen. Code, former § 347.) We observed that “[b]y making
    it a felony to administer poison with the intent to cause any injury,
    the Legislature has evidenced its concern for the dangers involved
    in such conduct, and the invocation of the second degree felony-
    murder rule in such cases when unforeseen death results serves
    further to deter such dangerous conduct.” (Mattison, at p. 186.) We
    emphasized, however, that “[t]o go further” and hold the
    commission of felony poisoning could both substitute for the
    required element of malice and elevate the murder to first degree
    “would make the use of poison serve double duty and result in
    criminal liability out of all proportion to the ‘turpitude of the
    offender.’ ” (Ibid.; see Blair, 
    supra,
     36 Cal.4th at p. 745 [observing
    that death resulting from a poisoning carried out with “intent to
    injure or intoxicate the victim” is second degree felony murder].)
    Drawing parallels to the lying in wait and torture contexts, we
    observed that “[w]hen it is contended that a killing was committed
    by poison it likewise must be established that the killing was
    21
    PEOPLE v. BROWN
    Opinion of the Court by Groban, J.
    murder. ‘[I]t is not enough to show that a poison was administered
    and that a death resulted. If the poison was innocently given under
    the belief that it was a harmless drug and that no serious results
    would follow, there would be no malice, express or implied, and any
    resulting death would not be murder. [Citation.] If, however, the
    defendant administered poison to his victim for an evil purpose, so
    that malice aforethought is shown, it is no defense that he did not
    intend or expect the death of his victim.’ ” (Mattison, supra,
    4 Cal.3d at p. 183.)
    The parties debate the significance of these observations.
    The Attorney General cites Mattison in support of his argument
    that a showing of implied malice in giving the victim poison is
    sufficient to elevate it to the first degree. He would have us read
    Mattison as holding that if the prosecution proves the defendant
    administered the deadly poison with malice, the murder is
    categorically first degree murder. Brown contends that Mattison’s
    observation that the poisoning must be done with an “ ‘evil
    purpose’ ” supports her construction of the statutory language as
    requiring something more than malice in the administration of the
    poison. (Mattison, supra, 4 Cal.3d at p. 183.) Mattison does not
    clearly support either position.
    In Mattison, we were not called upon to decide whether the
    prosecution must prove a state of mind in the administration of
    poison that is more culpable than malice for the murder to be in
    the first degree. Instead, the question before us was whether the
    defendant had been validly convicted of second degree murder by
    means of poison. (Mattison, supra, 4 Cal.3d at pp. 180–182.) We
    did not identify the specific mental state necessary to elevate a
    murder by means of poison to the first degree. However, our
    holding rested on the premise that to be a first degree murder, the
    act of using poison must be carried out with a state of mind more
    22
    PEOPLE v. BROWN
    Opinion of the Court by Groban, J.
    culpable than that associated with second degree murder on a
    felony murder theory, i.e., more culpable than “ ‘willfully
    mingl[ing] any poison with any food, drink or medicine, with intent
    that the same shall be taken by any human being to his injury
    . . . .’ ” (Id. at p. 184.)
    While Mattison, supra, 4 Cal.3d at page 186 made clear that to
    prove first degree murder by poison, the prosecution must show a
    mental state more culpable than willful administration of poison
    with intent to injure, our cases have also made clear it is not
    necessary to prove the defendant administered the poison with
    intent to kill.8 This rule emerged out of automatic appeals in death
    penalty cases, in which we distinguished first degree poison
    murder from the poison-murder special circumstance, which
    requires that “[t]he defendant intentionally killed the victim by the
    administration of poison.” (§ 190.2, subd. (a)(19).) In Catlin, 
    supra,
    26 Cal.4th at page 158, we relied in part on the special
    circumstance’s intent to kill requirement to reject the defendant’s
    challenge to the special circumstance as inadequately narrowing
    the class of death-eligible defendants. We observed that first
    degree poison murder encompasses a broader class of defendants
    than the poison murder special circumstance because “[t]he special
    circumstance allegation, unlike the definition of first degree
    murder by poison, requires proof that the defendant intentionally
    killed the victim.” (Ibid.) In Jennings, 
    supra,
     
    50 Cal.4th 616
    , we
    relied on the special circumstance’s intent to kill requirement to
    reject the defendant’s claim that the jury’s “not true” finding on the
    poison murder special circumstance meant that “he could not have
    8
    As noted above, we have reached similar conclusions in the
    torture and lying in wait contexts. (Gutierrez, supra, 28 Cal.4th at
    p. 1148; Davenport, supra, 41 Cal.3d at p. 271.)
    23
    PEOPLE v. BROWN
    Opinion of the Court by Groban, J.
    been convicted of first degree murder by poison.” (Id. at p. 639.) In
    Jennings, parents intentionally gave three powerful sedatives to
    their five-year-old son, whom they had been starving and brutally
    beating. (Id. at pp. 630–634, 640–641.) The defendant — the
    child’s father — argued that because the jury had found the poison
    murder special circumstance “not true,” it could not have based its
    first degree murder verdict on a poison murder theory. (Id. at
    p. 639.) In rejecting this argument, we reasoned that the jury’s not
    true finding did not necessarily mean it had acquitted the
    defendant of first degree murder because a showing of intent to kill
    is not necessary to prove first degree murder when a murder is by
    means of poison. (Id. at pp. 639–640.)9
    9
    The Attorney General relies on Jennings to argue that all
    that is required for a first degree poison murder conviction is a
    showing of malice. He points out that, in distinguishing the special
    circumstance, we observed “the jury still could have reasonably
    found defendant guilty of first degree murder by poison” even if it
    did not find he acted with premeditated intent to kill “if it found
    that either codefendant acted with implied malice.” (Jennings,
    
    supra,
     50 Cal.4th at p. 640.) It is true that Jennings addressed the
    sufficiency of the evidence to support a conviction of first degree
    poison murder. (Id. at pp. 639–641.) But we were not presented
    with the question we now consider: whether a showing of a mental
    state more culpable than malice in connection with administering
    the poison is required to elevate a murder by means of poison from
    the second degree to the first degree. Read in this context, the
    portion of Jennings on which the Attorney General relies simply
    reiterates that separate proof of premeditated intent to kill is not
    required to establish that a murder by means of poison is in the
    first degree. (See also Diaz, 
    supra,
     3 Cal.4th at p. 538 [rejecting
    defendant’s argument for reversal based on insufficient evidence of
    “premeditation and deliberation” on the ground that the evidence
    showed the murders “could not have been spontaneous acts” and
    observing that where “a murder is accomplished by means of
    24
    PEOPLE v. BROWN
    Opinion of the Court by Groban, J.
    In summary, the act of killing by poison may support a finding
    of a second degree murder, a first degree murder, or a special
    circumstance. The distinguishing factor is the defendant’s mental
    state. Like a murder by means of torture or lying in wait, a murder
    by means of poison is first degree murder when evidence of how the
    defendant carried out the poisoning demonstrates a mental state
    that is “the functional equivalent of proof of premeditation,
    deliberation and intent to kill.” (Ruiz, supra, 44 Cal.3d at p. 614;
    see Sanchez, supra, 24 Cal. at p. 29 [in context of poison, lying in
    wait, and torture, the means used provide “conclusive evidence of
    premeditation”]; Steger, supra, 16 Cal.3d at p. 546 [“same proof of
    deliberation and premeditation” required for torture murder as “for
    other types of first degree murder”].) The use of poison, standing
    alone, does not fulfill this requirement unless it is carried out with
    a state of mind more culpable than the malice required for a second
    degree murder conviction, i.e., more culpable than either (a)
    intending to kill the victim without premeditation and deliberation
    (i.e., express malice), or (b) intentionally giving the victim poison
    knowing that doing so was dangerous to human life and with
    conscious disregard for human life (i.e., implied malice). While no
    separate showing of premeditated intent to kill is required for first
    degree murder by poison (Jennings, supra, 50 Cal.4th at pp. 639–
    640), the poisoning nevertheless must be carried out with a mental
    state more culpable than malice.
    We now clarify that to prove a murder by poison is in the first
    degree, the prosecution must show that the defendant
    poison,” proof of premeditated and deliberate intent to kill is not
    required].)
    25
    PEOPLE v. BROWN
    Opinion of the Court by Groban, J.
    deliberately10 gave the victim poison with the intent to kill the
    victim or inflict injury likely to cause the victim’s death.11 Reading
    this requirement into “murder . . . by means of poison” (§ 189, subd.
    (a)) ensures that a first degree poison murder is equivalent in
    turpitude to a willful, deliberate, and premeditated killing, without
    calling into question our prior cases holding that the prosecution
    need not separately prove premeditated intent to kill. 12 As
    discussed, the fact that the defendant killed the victim with poison
    is not alone dispositive. Instead, it is the defendant’s mental state
    in giving the victim the poison that determines whether the act is
    murder and if so, whether the murder is in the first or second
    degree. A murder carried out by deliberately giving the victim
    poison with the intent to kill the victim or inflict injury likely to
    10
    In this context, “deliberately” means carefully weighing the
    considerations for and against a choice and, knowing the
    consequences, deciding to act. (See CALCRIM No. 521.)
    11
    Brown proposes we hold that first degree poison murder
    “requires proof that defendant willfully, deliberately, and with
    premeditation administered the poison” to the victim. This does
    not quite capture the Legislature’s intent in designating poison
    murder as murder in the first degree. A poison may be given
    willfully, deliberately, and with premeditation with an intent to
    sicken, injure, or intoxicate the victim, or even with benign intent.
    (Blair, supra, 36 Cal.4th at p. 745; Mattison, supra, 4 Cal.3d at
    p. 183.) It is the defendant’s deliberately giving the victim the
    substance with the intent to kill the victim or inflict injury likely
    to cause the victim’s death that makes a poison murder equivalent
    in its “degree of atrociousness” to a premeditated murder. (Code
    commrs., note foll., Ann. Pen. Code, § 189, supra, at p. 82; Milton,
    supra, 145 Cal. at pp. 170–171; Sanchez, supra, 24 Cal. at p. 29.)
    12
    Proof that the defendant deliberately gave the victim poison
    with intent to kill is sufficient, though not necessary (deliberately
    giving the victim the poison with the intent to inflict injury likely
    to cause the victim’s death would also be sufficient), to elevate a
    murder to the first degree.
    26
    PEOPLE v. BROWN
    Opinion of the Court by Groban, J.
    cause the victim’s death is more “cruel and aggravated” than other
    “malicious or intentional killing[s]” both because such a killing
    involves preparation and planning and because the killer
    intentionally deprives the victim of any chance of escape or self-
    defense. (Sanchez, supra, 24 Cal. at pp. 29, 28; id. at p. 30; see
    Catlin, 
    supra,
     26 Cal.4th at p. 159 [“The poisoner acts
    surreptitiously, thus avoiding detection and defeating any chance
    at self-defense, and often betrays the most intimate trust”]; cf. 4
    Blackstone Commentaries 196 [“Of all species of deaths the most
    detestable is that of poison; because it can of all others be the least
    prevented either by manhood or forethought”].) Such calculated,
    deliberate murders are both “more deplorable than others” and
    more easily “prevented than others by the deterrent effect of severe
    penalties.” (Steger, supra, 16 Cal.3d at p. 545.) It is these
    characteristics that the Legislature had in mind when it
    designated murder by means of poison as a kind of first degree
    murder, for which the only punishment at the time was death. (See
    Code commrs., note foll., Ann. Pen. Code, § 189, supra, at p. 82
    [division of murder into degrees based on “manifest injustice” of
    imposing death penalty in cases that “differed greatly from each
    other in the degree of atrociousness”].) A first degree murder
    conviction based on the mere “use of poison,” without proof of a
    mental state more culpable than malice, would “result in criminal
    liability out of all proportion to the ‘turpitude of the offender.’ ”
    (Mattison, supra, 4 Cal.3d at p. 186, italics omitted.)
    While the trial court’s instructions required the jury to find
    Brown acted with implied malice, they did not require the jury to
    find that Brown acted with any specific, heightened mental state
    in feeding Dae-Lynn her breast milk. The instructions thus
    allowed the jury to convict Brown of first degree murder without
    finding she deliberately gave her newborn daughter poison with
    27
    PEOPLE v. BROWN
    Opinion of the Court by Groban, J.
    the intent to kill her or inflict injury likely to cause her death.
    Indeed, they permitted the jury to convict Brown of first degree
    murder even if it believed Brown fed her baby the breast milk with
    the intent to bond with her, nourish her, treat her illness, or soothe
    her. Such a conviction would not reflect a jury finding that, in
    giving the victim the poison, the defendant acted with the
    “calculated deliberation” or “cold-blooded intent” we require to
    elevate a murder to the first degree. (Steger, supra, 16 Cal.3d at
    p. 546.)
    Accordingly, we conclude that the trial court was required to
    instruct the jury that to find Brown guilty of first degree murder,
    it had to find that she deliberately gave her newborn daughter
    poison with the intent to kill her or inflict injury likely to cause her
    death. Its failure to so instruct was error.
    B. Prejudice
    The omission of an element of an offense from a jury
    instruction violates “the right to a jury trial under the Sixth
    Amendment to the United States Constitution” by depriving the
    defendant of “a jury properly instructed in the relevant law.” (In
    re Martinez (2017) 
    3 Cal.5th 1216
    , 1224; see Neder v. United States
    (1999) 
    527 U.S. 1
    , 12 (Neder).) Having found such an error, we
    must “examin[e] the entire cause, including the evidence, and
    consider[] all relevant circumstances.” (People v. Aledamat (2019)
    
    8 Cal.5th 1
    , 13 (Aledamat).) Unless, based on this examination, we
    conclude “beyond a reasonable doubt that the error complained of
    did not contribute to the verdict obtained,” we reverse the
    conviction. (Chapman v. California (1967) 
    386 U.S. 18
    , 24; see
    Neder, at p. 15.)
    In a more typical murder by poison case, in which a defendant
    is alleged to have surreptitiously put arsenic in candy, cyanide in
    28
    PEOPLE v. BROWN
    Opinion of the Court by Groban, J.
    vitamin capsules, or strychnine in a glass of milk, the record is
    likely to supply overwhelming evidence that the defendant
    deliberately gave the victim poison and did so, if not with the intent
    to kill the victim, then at least with the intent to inflict injury likely
    to cause the victim’s death. (See, e.g., Albertson, supra, 
    23 Cal.2d 550
    ; Blair, 
    supra,
     36 Cal.4th at pp. 745–746; Cobler, supra,
    2 Cal.App.2d at pp. 377–379.) In this more typical fact pattern,
    this mental state element also is likely to be uncontested, such that
    if a trial court has omitted it from the first degree murder
    instruction, we may conclude “beyond a reasonable doubt . . . that
    the jury verdict would have been the same absent the error.”
    (Neder, 
    supra,
     527 U.S. at p. 17; see People v. Mil (2012) 
    53 Cal.4th 400
    , 417 [missing element error “is harmless when ‘the omitted
    element was uncontested and supported by overwhelming
    evidence, such that the jury verdict would have been the same
    absent the error . . .’ ”].)
    This case, however, is different. Based on the record here, a
    rational jury — if properly instructed — could have concluded the
    prosecution had not met its burden to prove that Brown
    deliberately gave her newborn daughter poison. (See Neder, 
    supra,
    527 U.S. at p. 19.) A rational jury could have given credence to
    Brown’s statement that the thought of feeding her daughter drugs
    via her breast milk had never “even come across [her] mind.”
    Moreover, evidence in the record would allow a rational jury to
    conclude the prosecution had not met its burden to prove that
    Brown fed her daughter her breast milk with the intent to kill her
    or to inflict injury on her that was likely to cause her death. In
    response to questions from the police investigator about the cause
    of Dae-Lynn’s death, Brown expressed her love for her daughter
    and her excitement about being a mom. And when the investigator
    told Brown the autopsy report showed that drugs caused her
    29
    PEOPLE v. BROWN
    Opinion of the Court by Groban, J.
    daughter’s death, she responded: “[T]hat . . . kills me because I was
    only trying to help her. I didn’t wanna try to harm my daughter at
    all. I never would intentionally.” Evidence that Brown was afraid
    authorities would take her newborn daughter from her and that
    she tried to save her daughter’s life by summoning help and
    administering CPR could also support a reasonable doubt as to
    whether Brown intended to kill her daughter or to injure her in a
    way likely to cause her death.
    Indeed, the prosecutor did not argue Brown intended to kill
    or even harm her daughter. Instead, her closing argument focused
    the jury’s attention on Brown’s failure to perform her parental
    duties by taking illegal drugs while pregnant, failing to get
    prenatal care, giving birth in a hotel room without proper medical
    assistance, failing to take her baby to the doctor immediately after
    birth, failing to take her baby to the doctor when she began to
    suspect her baby was showing symptoms of withdrawal, and
    feeding her baby her breast milk after smoking methamphetamine
    and heroin. Addressing Brown’s mental state in administering the
    poison, the prosecutor argued that “the only difference between
    first degree and second degree is that first degree requires . . . the
    People prove the murder was done by using poison.” At the
    conclusion of her argument, the prosecutor emphasized that “you
    can still love someone but act intentionally and prove that you are
    acting intentionally because you repeat the behavior, knowing the
    consequences are dangerous to human life, knowing them because
    you are a drug user. You are an addict yourself. Performing them
    with knowledge that this is going to be dangerous and repeating
    them over and over again. You can still do all of that and love the
    person that you are doing them to. It’s one of the horrible parts
    about being a human being. And that’s exactly what she did in this
    30
    PEOPLE v. BROWN
    Opinion of the Court by Groban, J.
    case. And she did it by introducing poison into her daughter’s
    system.”
    The Attorney General contends any instructional error was
    harmless because, in his view, the evidence at trial established that
    Brown knew the drugs she was taking would pass into her breast
    milk, but she still intentionally fed her baby the breast milk. The
    Attorney General’s argument is based on a misconception of our
    task. In assessing prejudice in this context, the question is not
    whether there is evidence in the record that would support a jury
    finding of the missing element. Instead, we ask whether we can
    conclude beyond a reasonable doubt that “the jury verdict would
    have been the same” had the jury been instructed on the missing
    element. (Neder, supra, 527 U.S. at p. 17.) If “the record contains
    evidence that could rationally lead to a contrary finding with
    respect to the omitted element,” the error is prejudicial. (Id. at
    p. 19.) The Attorney General’s argument also is based on an
    incorrect understanding of the omitted element. As we have
    clarified, administering poison with malice only supports a
    conviction of second degree murder; for first degree murder, the
    prosecution must show the defendant deliberately gave the victim
    the poison with the intent to kill the victim or inflict injury likely
    to cause death. The Attorney General’s contention that Brown
    knew the drugs she was taking would pass into her breast milk and
    intentionally fed her baby the breast milk despite this knowledge
    fails to address the central question: whether Brown deliberately
    gave the drugs to her baby with the intent to kill her or inflict
    injury on her likely to cause her death.
    On this record, we cannot conclude beyond a reasonable doubt
    that the jury would have found Brown guilty of first degree murder
    had it been instructed that to do so, it had to find that she
    deliberately gave her newborn daughter poison with the intent to
    31
    PEOPLE v. BROWN
    Opinion of the Court by Groban, J.
    kill her or inflict injury likely to cause her death. The omission of
    this element from the jury instructions was prejudicial.
    III. CONCLUSION
    Because the trial court failed to instruct the jury on the
    mental state element of first degree murder by poison and because
    this error was prejudicial, we reverse the judgment. We remand to
    the Court of Appeal with directions to return the case to the
    superior court for further proceedings consistent with our
    opinion.13
    13
    On remand, the superior court shall consider the potential
    applicability of recent sentencing reforms, including Assembly Bill
    No. 518 (2021–2022 Reg. Sess.) and Senate Bill No. 567 (2021–2022
    Reg. Sess.). (§§ 654, subd. (a), 1170, subd. (b)(6).) Our disposition
    leaves intact Brown’s conviction of child abuse (§ 237A) with an
    enhancement for willful harm or injury resulting in the death of a
    child (§ 12022.95), along with her convictions of possession of a
    controlled substance for sale (Health & Safety Code, § 11351) and
    possession of marijuana for sale (id. § 11359, subd. (b)). The parties
    debate whether there is a legal basis for the trial court to accept a
    reduction of the first degree murder conviction to second degree
    murder if the prosecution decides not to retry the first degree
    murder charge. (See Steger, supra, 16 Cal.3d at p. 553; Chiu,
    supra, 59 Cal.4th at p. 168.) We express no view on this question.
    32
    PEOPLE v. BROWN
    Opinion of the Court by Groban, J.
    GROBAN, J.
    We Concur:
    GUERRERO, C. J.
    CORRIGAN, J.
    LIU, J.
    KRUGER, J.
    JENKINS, J.
    CANTIL-SAKAUYE, J.*
    *
    Retired Chief Justice of California, assigned by the Chief
    Justice pursuant to article VI, section 6 of the California
    Constitution.
    33
    See next page for addresses and telephone numbers for counsel who
    argued in Supreme Court.
    Name of Opinion People v. Brown
    __________________________________________________________
    Procedural Posture (see XX below)
    Original Appeal
    Original Proceeding
    Review Granted (published)
    Review Granted (unpublished) XX NP opn. filed 7/16/19 – 3d Dist.
    Rehearing Granted
    __________________________________________________________
    Opinion No. S257631
    Date Filed: March 2, 2023
    __________________________________________________________
    Court: Superior
    County: Shasta
    Judge: Stephen H. Baker
    __________________________________________________________
    Counsel:
    David L. Polsky, under appointment by the Supreme Court, for
    Defendant and Appellant.
    Xavier Becerra and Rob Bonta, Attorneys General, Lance E. Winters,
    Chief Assistant Attorney General, Michael P. Farrell, Assistant
    Attorney General, R. Todd Marshall, Catherine Chatman, Christopher
    J. Rench, Rachelle A. Newcomb, A. Kay Lauterbach and Cameron M.
    Goodman, Deputy Attorneys General, for Plaintiff and Respondent.
    Keiter Appellate Law and Mitchell Keiter for Amicus Populi as Amicus
    Curiae on behalf of Plaintiff and Respondent.
    Counsel who argued in Supreme Court (not intended for
    publication with opinion):
    David L. Polsky
    Attorney at Law
    P.O. Box 118
    Ashford, CT 06278
    (860) 429-5556
    Cameron M. Goodman
    Deputy Attorney General
    1300 I Street, Suite 125
    Sacramento, CA 94244-2550
    (916) 210-6330