Cite as: 502 U. S. 62 (1991)
Opinion of the Court
charged McGuire with second-degree murder, it was required to prove that Tori's death was caused by the defendant's intentional act. Proof of Tori's battered child status helped to do just that; although not linked by any direct evidence to McGuire, the evidence demonstrated that Tori's death was the result of an intentional act by someone, and not an accident. The Court of Appeals, however, ignored the principle of battered child syndrome evidence in holding that this evidence was incorrectly admitted. For example, the court stated that "[e]vidence cannot have probative value unless a party connects it to the defendant in some meaningful way." 902 F. 2d, at 753. We conclude that the evidence of prior injuries presented at McGuire's trial, whether it was directly linked to McGuire or not, was probative on the question of the intent with which the person who caused the injuries acted.
In holding the prior injury evidence inadmissible, the Court of Appeals also relied on the theory that, because no claim was made at trial that Tori died accidentally, the battered child syndrome evidence was irrelevant and violative of due process. Id., at 754. This ruling ignores the fact that the prosecution must prove all the elements of a criminal offense beyond a reasonable doubt. In this second-degree murder case, for example, the prosecution was required to demonstrate that the killing was intentional. Cal. Penal Code Ann. §§ 187, 189 (West 1988). By eliminating the possibility of accident, the evidence regarding battered child syndrome was clearly probative of that essential element, especially in light of the fact that McGuire had claimed prior to trial that Tori had injured herself by falling from the couch. The Court of Appeals, however, ruled that the evidence should have been excluded because McGuire did not raise the defense of accidental death at trial. But the prosecution's burden to prove every element of the crime is not relieved by a defendant's tactical decision not to contest an essential element of the offense. In the federal courts, "[a]
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