An Oklahoma jury convicted Brenda Andrew of murdering her husband, Rob Andrew, and sentenced her to death. The State spent significant time at trial introducing evidence about Andrew’s sex life and about her failings as a mother and wife, much of which it later conceded was irrelevant. In a federal habeas petition, Andrew argued that this evidence had been so prejudicial as to violate the Due Process Clause. The Court of Appeals rejected that claim because, it thought, no holding of the U.S. Supreme Court established a general rule that the erroneous admission of prejudicial evidence could violate due process. That was wrong. By the time of Andrew’s trial, the U.S. Supreme Court had made clear that when “evidence is introduced that is so unduly prejudicial that it renders the trial fundamentally unfair, the Due Process Clause of the Fourteenth Amendment provides a mechanism for relief.” Payne v. Tennessee, 501 U. S. 808, 825 (1991).

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