Stay up to date with notifications from The IndependentNotifications can be managed in browser preferences.Jump to contentThank you for registeringPlease refresh the page or navigate to another page on the site to be automatically logged inPlease refresh your browser to be logged inAllNewsSportCultureLifestyleLuigi Mangione's defense team will argue a psychiatric defense of "extreme emotional disturbance" in his state murder trial for the killing of UnitedHealthcare CEO Brian Thompson.This defense, if successful, could lead to a conviction of manslaughter instead of murder, potentially resulting in a reduced prison sentence, and is distinct from a not guilty by reason of insanity defense.The defense strategy was revealed after a secret hearing, and Judge Gregory Carro announced he would unseal records pertaining to the hearing and the defense's motion for a psychiatric defense.Mangione's lawyer expressed concern that unsealing these documents could prejudice him in his federal case, as the "extreme emotional disturbance" defense is not applicable in federal court.Mangione, who has pleaded not guilty to state and federal charges, is set to face his state trial beginning on Sept. 8, with his federal trial, involving stalking charges, scheduled for Oct. 13.In fullLuigi Mangione will use psychiatric defense at trial over UnitedHealthcare CEO’s murderThank you for registeringPlease refresh the page or navigate to another page on the site to be automatically logged inPlease refresh your browser to be logged in