Luigi Mangione pleaded guilty to two federal charges tied to the December 2024 killing of UnitedHealthcare CEO Brian Thompson during a surprise hearing in Manhattan federal court on Friday, August 14, 2026. Mangione is scheduled to be sentenced in December after reading a detailed statement about how he located and attacked Thompson. Mangione told Judge Margaret Garnett that years of severe back pain and difficult dealings with the health insurance system shaped his thinking. According to his courtroom statement, Mangione learned UnitedHealthcare planned an investor conference in New York City on December 4, 2024, even though the venue had not been publicly announced. How Did Mangione Find the Conference? Mangione said he searched online for information about the event and noticed that the guest list centered on executives and investors rather than patients or medical professionals. He also said he traveled to Manhattan from outside New York in November 2024 and emailed UnitedHealthcare executives while posing as an investor at a firm managing more than $50 billion, receiving a reply within an hour. Mangione further told the court that he used a 3D printer to make a gun and added a silencer and magazine. Thompson’s family sat behind federal prosecutors during the hearing and appeared emotional as Mangione spoke, while his lead attorney, Karen Friedman Agnifilo, watched him closely and offered support.