NEW YORK (AP) — Luigi Mangione will assert a psychiatric defense at his state murder trial in the killing of UnitedHealthcare CEO Brian Thompson, a judge said Wednesday. Judge Gregory Carro said Mangione’s lawyers have informed him they will attempt to show that he was suffering from “extreme emotional disturbance at the time of the occurrence.” By asserting a psychiatric defense, Mangione would effectively be admitting that he killed Thompson but did so because of mitigating circumstances. If a jury finds that Mangione was emotionally disturbed at the time of the killing, it could convict him of manslaughter instead of murder, meaning he’d be sentenced to less time in prison. It is not the same as a not guilty by reason of insanity defense, which would allow a defendant to go to a psychiatric facility instead of prison. Carro’s ruling came two weeks after he held a secret hearing on the matter at the request of the defense. He said he will unseal records pertaining to the hearing and the defense’s move for a psychiatric defense. Mangione, 28, has pleaded not guilty to state and federal charges in the Dec. 4, 2024, killing. His federal trial, which involves stalking charges, is set to begin on Oct. 13. He could spend his life in prison if convicted in either case.