Criminal Law
Mullaney v. Wilbur, 421 U.S. 684 (1975) (U.S. Supreme Court)
Study notes for Mullaney v. Wilbur: professor notes, cold call prep, exam angles, and memory aids.
The state must prove the absence of heat of passion on sudden provocation beyond a reasonable doubt to establish murder.
In Mullaney v. Wilbur, the U.S. Supreme Court addressed the constitutionality of Maine's criminal law regarding the burden of proof for manslaughter defenses. The Court held that shifting the burden to the defendant to prove 'heat of passion on sudden provocation' to reduce a murder charge to manslaughter infringes upon the Due Process rights guaranteed by the Fourteenth Amendment. A key takeaway for students is the balance between state interests and the fundamental rights of defendants, particularly the principle that the state must always prove guilt beyond a reasonable doubt. Professors might emphasize how this case illustrates the importance of maintaining the integrity of the criminal justice system and protecting against wrongful convictions based on inadequate proof regarding mental state.
M.A.P. - Malice, Aforethought, Prove (state must prove absence of provocation).
| Case | Distinction |
|---|---|
| State v. O'Keefe | State v. O'Keefe involved a different burden of proof framework, focusing on a defendant's ability to negate malice by demonstrating justification rather than the affirmative defense in Mullaney v. Wilbur. |
| In re Winship | In re Winship established the standard of 'beyond a reasonable doubt' for all critical elements of a criminal prosecution, reinforcing principles also found in Mullaney v. Wilbur. |
Ensuring the prosecution has the burden to prove all elements beyond a reasonable doubt upholds the presumption of innocence and the integrity of the legal system.
Allowing defendants to bear the burden of proof on certain defenses may enhance victim protections and streamline the prosecution of violent crimes.
This case is likely to appear in exams focusing on constitutional protections in criminal law, specifically regarding the burden of proof and the due process clause. Students should be prepared to analyze the implications of this ruling on the prosecution's responsibilities.