Mangione to pursue psychiatric defense in UnitedHealthcare CEO killing case

Luigi Mangione’s defense team plans to ask jurors to see his case through the lens of psychiatric impairment, a move that could reshape both the charge and the punishment if it succeeds. Judge Gregory Carro said Mangione’s lawyers told him they intend to present an affirmative psychiatric defense based on “extreme emotional disturbance,” and he ordered Mangione’s psychiatric records turned over to prosecutors immediately.

The ruling mattered because New York treats extreme emotional disturbance as an affirmative defense to second-degree murder, not a separate sympathy argument. To prevail, Mangione would have to prove the claim, and the legal effect could be significant: a murder charge could be reduced to manslaughter. New York court materials describe the standard as an emotional disturbance so severe that it produces a profound loss of self-control, and the reasonableness of that state is judged from the viewpoint of a person in the defendant’s situation under the circumstances as he believed them to be.

Carro also said he would unseal records from the earlier closed hearing on the defense issue, which had been held at the defense’s request two weeks earlier. The judge’s orders put the psychiatric question squarely before the court while also giving prosecutors access to the records they will need to test the claim. In practice, the defense will have to connect any mental-health evidence to Mangione’s state of mind at the time of the killing and persuade jurors that the disturbance was severe enough to meet the statute’s threshold.

The case stems from the Dec. 4, 2024, killing of Brian Thompson, 50, who was shot as he walked to a Manhattan hotel for UnitedHealth Group’s annual investor conference. Prosecutors say surveillance video showed a masked gunman shooting Thompson from behind, and they say the words “delay,” “deny” and “depose” were written on the ammunition. Mangione, 28, was arrested five days later at a McDonald’s in Altoona, Pennsylvania, about 230 miles west of Manhattan, and he has pleaded not guilty to state and federal charges.

Carro separately agreed to dismiss one count tied to possession of a large-capacity ammunition magazine after prosecutors consented. That count had already been undercut by an earlier ruling that barred use of the magazine at trial because Pennsylvania officers improperly searched it when Mangione was arrested. Mangione’s state trial is scheduled to begin on Sept. 8, 2026, and his federal stalking trial is set for Oct. 13, setting up two proceedings in which the psychiatric defense could shape both culpability and sentencing.