A California court convicted respondent Kenneth Roy of the robbery and first-degree murder of Archie Mannix. The State's theory, insofar as is relevant here, was that Roy, coming to the aid of a confederate who was trying to rob Mannix, helped the confederate kill Mannix. The trial judge gave the jury an instruction that permitted it to convict Roy of first-degree murder as long as it concluded that (among other...
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