Master The Supreme Court upheld New York's allocation of the burden of proving the affirmative defense of extreme emotional disturbance to the defendant without violating due process. with this comprehensive case brief.
Patterson v. New York is a foundational case on the constitutional limits of how states define crimes and allocate burdens of proof for defenses. Building on In re Winship's command that the state must prove every element of a crime beyond a reasonable doubt, and following closely after Mullaney v. Wilbur's constraints on defining malice and heat of passion, Patterson draws a sharper boundary between the facts the prosecution must prove as elements and the facts a defendant may be required to prove as affirmative defenses.
The decision is central to understanding modern criminal law's structure. It affirms states' discretion to design offenses and defenses—so long as the state does not offload to the defendant the burden of disproving an element of the crime. Patterson is therefore taught alongside Winship, Mullaney, Martin v. Ohio, and later Apprendi-line cases to illustrate how constitutional due process interacts with substantive definitions of crimes and with mitigation or excuse doctrines such as extreme emotional disturbance (EED), self-defense, and insanity.
Patterson v. New York, 432 U.S. 197 (1977) (U.S. Supreme Court)
New York charged the defendant with second-degree murder under a statute that defined the offense as intentionally causing the death of another person. The prosecution's evidence showed that the defendant's estranged wife had begun living with another man. After learning of the relationship, the defendant confronted them at the apartment, left, returned with a rifle, and fatally shot the man. The state proved intent to kill and causation beyond a reasonable doubt through eyewitness testimony, prior statements by the defendant indicating hostility and threats, and the circumstances of the shooting. Under New York law, a defendant could seek to mitigate murder to first-degree manslaughter by establishing the affirmative defense of extreme emotional disturbance (EED), which required the defendant to prove by a preponderance of the evidence that he acted under an extreme emotional disturbance for which there was a reasonable explanation or excuse, assessed from the defendant's perspective. The defendant introduced evidence of his intense emotional turmoil upon discovering his wife's relationship, but the jury found he had not carried his burden on EED and convicted him of second-degree murder. He argued on appeal that due process prohibited New York from placing on him the burden to prove EED and that the state was constitutionally required to prove the absence of EED beyond a reasonable doubt once the issue was raised.
Does the Due Process Clause permit a state to require a defendant to prove, by a preponderance of the evidence, the affirmative defense of extreme emotional disturbance that mitigates murder to manslaughter, so long as the prosecution proves all elements of the charged offense beyond a reasonable doubt?
Under the Due Process Clause, the prosecution must prove beyond a reasonable doubt every fact necessary to constitute the crime charged (In re Winship). However, a state may define the elements of its offenses and may, consistent with due process, place on the defendant the burden of proving an affirmative defense—such as extreme emotional disturbance—that does not serve to negate any element of the crime, provided the prosecution still proves each statutory element beyond a reasonable doubt. Mullaney v. Wilbur does not forbid this allocation where the mitigating circumstance is not itself an element of the offense as defined by state law; and Leland v. Oregon confirms that placing the burden of an affirmative defense (e.g., insanity) on the defendant is constitutionally permissible.
Yes. The Court held that New York's requirement that the defendant prove the affirmative defense of extreme emotional disturbance by a preponderance of the evidence does not violate due process because the state still must, and did, prove beyond a reasonable doubt all elements of second-degree murder.
The Court, in an opinion by Justice White, began by reaffirming In re Winship's principle that the state must prove beyond a reasonable doubt every element of the crime. It then examined the structure of New York's homicide law. Second-degree murder required proof that the defendant intended to cause the victim's death and in fact caused the death. New York's EED provision, by contrast, did not negate intent or causation; it operated solely to mitigate the degree of culpability by reducing murder to manslaughter when the defendant proved certain exculpatory circumstances. Distinguishing Mullaney v. Wilbur, the Court emphasized that in Maine the absence of heat of passion on sudden provocation was bound up with the element of malice aforethought for murder. Thus, in Mullaney, requiring a defendant to disprove heat of passion effectively shifted to the defendant the burden of disproving an element (malice). New York, however, removed "malice" from its statutory definition and made EED a separate, mitigating affirmative defense. As defined, EED did not contradict or disprove any element of murder; it did not contest that the defendant intentionally caused the death. Accordingly, placing on the defendant the burden to prove EED did not undercut Winship. The Court also rejected the argument that states could eviscerate Winship by manipulating elements and defenses, noting that due process would not permit recharacterizing elements as defenses to circumvent the reasonable-doubt standard. But New York's allocation aligned with historical practice and with precedents like Leland v. Oregon, upholding a defendant's burden to prove insanity. Because the prosecution proved intent and causation beyond a reasonable doubt and the EED claim was a distinct mitigating matter, the statute and the conviction were constitutional. Finally, the Court noted practical and policy considerations: Defendants typically have better access to evidence supporting personal mitigating circumstances; assigning them the burden to prove such matters by a preponderance is reasonable and does not risk conviction absent proof of the crime's elements.
Patterson demarcates the constitutional line between elements and affirmative defenses. It affirms states' latitude to require defendants to prove mitigating or excusing circumstances—such as EED, insanity, or, in some jurisdictions, self-defense—so long as those circumstances do not negate the elements of the offense. The case thus narrows Mullaney, reinforces Winship's core protection of the reasonable-doubt standard for elements, and frames later decisions like Martin v. Ohio (upholding a self-defense burden on the defendant) and Dixon v. United States (upholding a duress burden on the defendant). For law students, Patterson is essential to understanding how statutory drafting and constitutional due process interact in defining crimes and allocating proof burdens.
In Mullaney, Maine defined murder to include malice aforethought, which in turn depended on the absence of heat of passion; requiring the defendant to disprove heat of passion shifted to him the burden of disproving an element. In Patterson, New York defined murder simply as intentional killing and treated extreme emotional disturbance as a separate affirmative defense that did not negate intent or causation. Thus, placing the burden of EED on the defendant did not shift the burden on any element of the offense.
EED is a mitigating affirmative defense that, if proven by a preponderance of the evidence, reduces what would otherwise be murder to first-degree manslaughter. The defendant must show he acted under the influence of an extreme emotional disturbance for which there was a reasonable explanation or excuse, judged from the defendant's perspective under the circumstances as he believed them to be. It does not dispute that the defendant intended to kill; it mitigates culpability.
No. The Court reaffirmed Winship: the prosecution must prove every element of the offense beyond a reasonable doubt. Patterson clarifies that states can require defendants to prove affirmative defenses that do not negate any element. As long as the state proves intent and causation (here, the elements of murder) beyond a reasonable doubt, due process is satisfied.
Leland upheld a statute placing the burden of proving insanity on the defendant. The Patterson Court cited Leland to support the broader principle that due process allows states to assign to defendants the burden of proving affirmative defenses—mitigating or excusing circumstances separate from the elements of the offense—without violating the reasonable-doubt requirement for elements.
First, identify the statutory elements and the prosecution's burden to prove them beyond a reasonable doubt. Second, determine whether any defense is an affirmative defense or negates an element. If it negates an element (e.g., lack of intent), the state bears the burden. If it is a distinct affirmative defense (e.g., EED, insanity, duress in many jurisdictions), the defendant may constitutionally bear the burden, often by a preponderance.
Patterson v. New York cements a key doctrinal boundary: the Constitution insists the state prove every element of a crime beyond a reasonable doubt, but it permits states to allocate to defendants the burden to prove affirmative defenses that mitigate culpability without negating those elements. By distinguishing Mullaney and relying on Leland, the Court preserved Winship's core while recognizing state flexibility in structuring criminal codes.
For students and practitioners, Patterson underscores the importance of statutory definition. Whether a fact is an element or an affirmative defense determines who bears the burden and at what standard. Mastery of this framework is vital for charging decisions, motions, jury instructions, and appellate review in criminal cases.
Need to cite this case?
Generate a perfectly formatted Bluebook citation in seconds.
Use our Bluebook Citation Generator →