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Facts

MR. JUSTICE WHITE delivered the opinion of the Court. The question here is the constitutionality under the Fourteenth Amendment's Due Process Clause of burdening the defendant in a New York State murder trial with proving the affirmative defense of extreme emotional disturbance as defined by New York law. After a brief and unstable marriage, the appellant, Gordon Patterson, Jr., became estranged from his wife, Roberta. Roberta resumed an association with John Northrup, a neighbor to whom she had been engaged prior to her marriage to appellant. On December 27, 1970, Patterson borrowed a rifle from an acquaintance and went to the residence of his father-in-law. There, he observed his wife through a window in a state of semiundress in the presence of John Northrup. He entered the house and killed Northrup by shooting him twice in the head. Patterson was charged with second-degree murder. In New York there are two elements of this crime: (1) "intent to cause the death of another person"; and (2) "caus[ing] the death of such person or of a third person." . . . Malice aforethought is not an element of the crime. In addition, the State permits a person accused of murder to raise an affirmative defense that he "acted under the influence of extreme emotional disturbance for which there was a reasonable explanation or excuse." New York also recognizes the crime of manslaughter. A person is guilty of manslaughter if he intentionally kills another person "under circumstances which do not constitute murder because he acts under the influence of extreme emotional disturbance." Appellant confessed before trial to killing Northrup, but at trial he raised the defense of extreme emotional disturbance. The jury was instructed as to the elements of the crime of murder. Focusing on the element of intent, the trial court charged: "Before you, considering all of the evidence, can convict this defendant or anyone of murder, you must believe and decide that the People have established beyond a reasonable doubt that he intended, in firing the gun, to kill either the victim himself or some other human being . . . It is always the People's burden to prove his guilt, and to prove that he intended to kill in this instance beyond a reasonable doubt." . . . The jury was further instructed, consistently with New York law, that the defendant had the burden of proving his affirmative defense by a preponderance of the evidence. The jury was told that if it found beyond a reasonable doubt that appellant had intentionally killed Northrup but that appellant had demonstrated by a preponderance of the evidence that he had acted under the influence of extreme emotional disturbance, it had to find appellant guilty of manslaughter instead of murder. The jury found appellant guilty of murder. Judgment was entered on the verdict, and the Appellate Division affirmed. While appeal to the New York Court of Appeals was pending, this Court decided Mullaney v. Wilbur, in which the Court declared Maine's murder statute unconstitutional. Under the Maine statute, a person accused of murder could rebut the statutory presumption that he committed the offense with "malice aforethought" by proving that he acted in the heat of passion on sudden provocation. The Court held that this scheme improperly shifted the burden of persuasion from the prosecutor to the defendant and was therefore a violation of due process. In the Court of Appeals appellant urged that New York's murder statute is functionally equivalent to the one struck down in Mullaney and that therefore his conviction should be reversed. The Court of Appeals rejected appellant's argument, holding that the New York murder statute is consistent with due process. . . . The Court distinguished Mullaney on the ground that the New York statute involved no shifting of the burden to the defendant to disprove any fact essential to the offense charged since the New York affirmative defense of extreme emotional disturbance bears no direct relationship to any element of murder. This appeal ensued, and we noted probable jurisdiction. . . . We affirm. . . . In determining whether New York's allocation to the defendant of proving the mitigating circumstances of severe emotional disturbance is consistent with due process, it is therefore relevant to note that this defense is a considerably expanded version of the common-law defense of heat of passion on sudden provocation and that at common law the burden of proving the latter, as well as other affirmative defense - indeed, "all . . . circumstances of justification, excuse or alleviation" - rested on the defendant. This was the rule when the Fifth Amendment was adopted, and it was the American rule when the Fourteenth Amendment was ratified. Commonwealth v. York. In 1895 the common-law view was abandoned with respect to the insanity defense in federal prosecutions. Davis v. United States. . . . This ruling had wide impact on the practice in the federal courts with respect to the burden of proving various affirmative defenses, and the prosecution in a majority of jurisdictions in this country sooner or later came to shoulder the burden of proving the sanity of the accused and of disproving the facts constituting other affirmative defenses, including provocation. Davis was not a constitutional ruling, however, as Leland v. Oregon made clear. At issue in Leland v. Oregon was the constitutionality under the Due Process Clause of the Oregon rule that the defense of insanity must be proved by the defendant beyond a reasonable doubt. Noting that Davis "obviously establish[ed] no constitutional doctrine," . . . the Court refused to strike down the Oregon scheme, saying that the burden of proving all elements of the crime beyond a reasonable doubt, including the elements of premeditation and deliberation, was placed on the State under Oregon procedures and remained there throughout the trial. To convict, the jury was required to find each element of the crime beyond a reasonable doubt, based on all the evidence, including the evidence going to the issue of insanity. Only then was the jury "to consider separately the issue of legal sanity per se. . . ." This practice did not offend the Due Process Clause even though among the 20 States then placing the burden of proving his insanity on the defendant, Oregon was alone in requiring him to convince the jury beyond a reasonable doubt. Subsequently, the Court confirmed that it remained constitutional to burden the defendant with proving his insanity defense when it dismissed, as not raising a substantial federal question, a case in which the appellant specifically challenged the continuing validity of Leland v. Oregon. This occurred in Rivera v. Delaware. The claim in this Court was that Leland had been overruled by Winship and Mullaney. We dismissed the appeal as not presenting a substantial federal question. . . . We cannot conclude that Patterson's conviction under the New York law deprived him of due process of law. The crime of murder is defined by the statute, which represents a recent revision of the state criminal code, as causing the death of another person with intent to do so. The death, the intent to kill, and causation are the facts that the State is required to prove beyond a reasonable doubt if a person is to be convicted of murder. No further facts are either presumed or inferred in order to constitute the crime. The statute does provide an affirmative defense - that the defendant acted under the influence of extreme emotional disturbance for which there was a reasonable explanation - which, if proved by a preponderance of the evidence, would reduce the crime to manslaughter, an offense defined in a separate section of the statute. It is plain enough that if the intentional killing is shown, the State intends to deal with the defendant as a murderer unless he demonstrates the mitigating circumstances. . . . It seems to us that the State satisfied the mandate of Winship that it prove beyond a reasonable doubt "every fact necessary to constitute the crime with which [Patterson was] charged.". . . We are unwilling to reconsider Leland and Rivera. But even if we were to hold that a State must prove sanity to convict once that fact is put in issue, it would not necessarily follow that a State must prove beyond a reasonable doubt every fact, the existence or nonexistence of which it is willing to recognize as an exculpatory or mitigating circumstance affecting the degree of culpability or the severity of the punishment. Here, in revising its criminal code, New York provided the affirmative defense of extreme emotional disturbance, a substantially expanded version of the older heat-of-passion concept; but it was willing to do so only if the facts making out the defense were established by the defendant with sufficient certainty. The State was itself unwilling to undertake to establish the absence of those facts beyond a reasonable doubt, perhaps fearing that proof would be too difficult and that too many persons deserving treatment as murderers would escape that punishment if the evidence need merely raise a reasonable doubt about the defendant's emotional state. It has been said that the new criminal code of New York contains some 25 affirmative defenses which exculpate or mitigate but which must be established by the defendant to be operative. The Due Process Clause, as we see it, does not put New York to the choice of abandoning those defenses or undertaking to disprove their existence in order to convict of a crime which otherwise is within its constitutional powers to sanction by substantial punishment. The requirement of proof beyond a reasonable doubt in a criminal case is "bottomed on a fundamental value determination of our society that it is far worse to convict an innocent man than to let a guilty man go free." Winship. The social cost of placing the burden on the prosecution to prove guilt beyond a reasonable doubt is thus an increased risk that the guilty will go free. While it is clear that our society has willingly chosen to bear a substantial burden in order to protect the innocent, it is equally clear that the risk it must bear is not without limits; and Mr. Justice Harlan's aphorism provides little guidance for determining what those limits are. Due process does not require that every conceivable step be taken, at whatever cost, to eliminate the possibility of convicting an innocent person. Punishment of those found guilty by a jury, for example, is not forbidden merely because there is a remote possibility in some instances that an innocent person might go to jail. It is said that the common-law rule permits a State to punish one as a murderer when it is as likely as not that he acted in the heat of passion or under severe emotional distress and when, if he did, he is guilty only of manslaughter. But this has always been the case in those jurisdictions adhering to the traditional rule. It is also very likely true that fewer convictions of murder would occur if New York were required to negative the affirmative defense at issue here. But in each instance of a murder conviction under the present law, New York will have proved beyond a reasonable doubt that the defendant has intentionally killed another person, an act which it is not disputed the State may constitutionally criminalize and punish. If the State nevertheless chooses to recognize a factor that mitigates the degree of criminality or punishment, we think the State may assure itself that the fact has been established with reasonable certainty. To recognize at all a mitigating circumstance does not require the State to prove its nonexistence in each case in which the fact is put in issue, if in its judgment this would be too cumbersome, too expensive, and too inaccurate. This view may seem to permit state legislatures to reallocate burdens of proof by labeling as affirmative defenses at least some elements of the crimes now defined in their statutes. But there are obviously constitutional limits beyond which the States may not go in this regard. "[I]t is not within the province of a legislature to declare an individual guilty or presumptively guilty of a crime." McFarland v. American Sugar Refining Co.. The legislature cannot "validly command that the finding of an indictment, or mere proof of the identity of the accused, should create a presumption of the existence of all the facts essential to guilt." . . . It is urged that Mullaney v. Wilbur necessarily invalidates Patterson's conviction. In Mullaney the charge was murder, which the Maine statute defined as the unlawful killing of a human being "with malice aforethought, either express or implied." The trial court instructed the jury that the words "malice aforethought" were most important because "malice aforethought is an essential and indispensable element of the crime of murder." Malice, as the statute indicated and as the court instructed, could be implied and was to be implied from "any deliberate, cruel act committed by one person against another suddenly . . . or without a considerable provocation," in which event an intentional killing was murder unless by a preponderance of the evidence it was shown that the act was committed "in the heat of passion, on sudden provocation." The instructions emphasized that "`malice aforethought and heat of passion on sudden provocation are two inconsistent things'; thus, by proving the latter the defendant would negate the former.". . . Proof beyond a reasonable doubt of `malice aforethought' (in the sense of `premeditation') is not essential to conviction. . . . [T]he failure of the State to prove `premeditation' in this context is not fatal to such a prosecution because, by legal definition under Maine law, a killing becomes unlawful and punishable as `murder' on proof of `any deliberate, cruel act, committed by one person against another, suddenly without any, or without a considerable provocation.' State v. Neal. Neal has been frequently cited with approval by our Court." . . . . . . This Court, accepting the Maine court's interpretation of the Maine law, unanimously agreed with the Court of Appeals that Wilbur's due process rights had been invaded by the presumption casting upon him the burden of proving by a preponderance of the evidence that he had acted in the heat of passion upon sudden provocation. Mullaney's holding, it is argued, is that the State may not permit the blameworthiness of an act or the severity of punishment authorized for its commission to depend on the presence or absence of an identified fact without assuming the burden of proving the presence or absence of that fact, as the case may be, beyond a reasonable doubt. In our view, the Mullaney holding should not be so broadly read. . . . Mullaney surely held that a State must prove every ingredient of an offense beyond a reasonable doubt, and that it may not shift the burden of proof to the defendant by presuming that ingredient upon proof of the other elements of the offense. This is true even though the State's practice, as in Maine, had been traditionally to the contrary. Such shifting of the burden of persuasion with respect to a fact which the State deems so important that it must be either proved or presumed is impermissible under the Due Process Clause. It was unnecessary to go further in Mullaney. The Maine Supreme Judicial Court made it clear that malice aforethought, which was mentioned in the statutory definition of the crime, was not equivalent to premeditation and that the presumption of malice traditionally arising in intentional homicide cases carried no factual meaning insofar as premeditation was concerned. . . . Premeditation was not within the definition of murder; but malice, in the sense of the absence of provocation, was part of the definition of that crime. Yet malice, or in other words, lack of provocation, was presumed and could be rebutted by the defendant only by proving by a preponderance of the evidence that he acted with heat of passion upon sudden provocation. . . . As we have explained, nothing was presumed or implied against Patterson; and his conviction is not invalid under any of our prior cases. The judgment of the New York Court of Appeals is Affirmed.