Luigi Mangione pleaded guilty Aug. 14 to two federal stalking counts tied to the Dec. 4, 2024, killing of UnitedHealthcare CEO Brian Thompson in Manhattan. Mangione told District Judge Margaret M. Garnett that he shot Thompson, understood the act was illegal, and accepted responsibility without a negotiated deal. During the hearing, Mangione said years of back pain shaped his anger toward the health care system. According to reporters in the courtroom, Mangione learned about a UnitedHealthcare conference for executives and investors, contacted company leadership while posing as an investor to obtain the location, and used a 3-D printer to make part of the gun involved in the attack. What Happens to Mangione Now? Mangione's attorney, Karen Friedman Agnifilo, said outside court that her client believed the system had failed him and “destroyed his life.” She also argued that pursuing federal and New York state cases at the same time violates his rights, and confirmed that the defense has asked for the state charges to be dismissed under New York's double jeopardy law. Federal prosecutors are not offering Mangione sentencing concessions because the guilty plea was not part of a prearranged agreement. U.S. Attorney for the Southern District of New York Jamie McDonald described the attack as deliberate and premeditated, saying prosecutors will seek the maximum punishment allowed by law. Mangione is scheduled to be sentenced Dec. 18, while his separate New York trial is set to begin in September and could result in life in prison if he is convicted. A January ruling previously dismissed the federal firearm murder count and a separate allegation involving a silencer, according to The New York Times.