In a dramatic turn of proceedings in Manhattan federal court Friday, 28-year-old Luigi Mangione formally admitted to the assassination of UnitedHealthcare Chief Executive Officer Brian Thompson, entering guilty pleas to federal charges of interstate stalking that resulted in death. The public admission marked a stark reversal from Mangione’s earlier not guilty pleas in both the federal and state court cases stemming from the December 2024 killing that sent shockwaves through the U.S. healthcare and business communities.
Dressed in a standard beige prison uniform and appearing visibly somber throughout the 90-minute hearing, Mangione spoke clearly to the court as he read out a detailed account of his premeditated attack. He confirmed that he planned the killing months in advance, crossing state lines from his home state of Pennsylvania to New York with the explicit intent to end Thompson’s life. The weapon he used, he told the court, was a homemade firearm he produced on a 3D printer, which he modified with an unauthorized silencer and high-capacity magazine ahead of the attack.
Mangione told the court his motive stemmed from years of chronic severe pain he suffered following a broken back injury, claiming his frustrating and damaging experiences with the U.S. healthcare system pushed him to target Thompson. After learning UnitedHealthcare would host its annual investor conference at a midtown Manhattan hotel in early December 2024, Mangione said he posed as an investor in emails to company organizers to obtain details about the event and Thompson’s schedule. He then traveled to New York ahead of the conference to carry out his plan.
On the morning of December 4, 2024, as Thompson walked into the midtown Manhattan hotel for the conference, Mangione shot the 50-year-old executive from behind. Thompson, a father of two, died from his injuries shortly after the attack. “On the morning of 4 December 2024, I shot Mr Thompson in Manhattan and he died,” Mangione repeated in his statement to the court Friday, confirming the core fact of the killing.
Following the plea hearing, Thompson’s family released a statement calling the guilty plea “an important step toward justice for Brian and for our family.” The family noted they will continue pursuing justice in both New York state courts and in Pennsylvania, where Mangione was taken into custody shortly after the shooting. “While nothing will ease the pain of losing him, we are grateful that the federal justice system has held the person responsible for this heinous act accountable,” the statement read. “Now we look to the court to ensure that sentencing reflects the severity of this crime.”
Mangione now faces a maximum sentence of life in federal prison, with his federal sentencing hearing scheduled for December 18. But the guilty plea has immediately ignited a major legal battle over whether Mangione can also face prosecution on eight separate state charges, which include second-degree murder, possession of a forged fake driver’s license, and six counts of illegal criminal weapons possession. His legal team is pushing to have the entire state case dismissed ahead of its scheduled September trial start date.
Speaking to reporters outside the courthouse after Friday’s hearing, Mangione’s lead defense attorney Karen Friedman Agnifilo argued that pursuing state charges after Mangione’s federal guilty plea violates the U.S. Constitution’s double jeopardy protection, which prohibits prosecuting a person twice for the same criminal offense. “New York law does not permit a person to be prosecuted and punished twice for the exact same crime,” Friedman Agnifilo said, adding that Mangione has already taken “full responsibility” for Thompson’s death through his federal guilty plea.
But the Manhattan District Attorney’s office has rejected the defense’s argument and says it remains fully committed to moving forward with the state prosecution. In an official statement released after the hearing, the DA’s office said it welcomed the accountability Mangione’s guilty plea provided for Thompson’s family. “While federal sentencing is pending, we are prepared to litigate the defence motions. The Manhattan DA’s Office remains committed to seeking justice for Mr Thompson and his family,” the statement read. The legal fight over the double jeopardy motion is expected to play out in state courts in the coming weeks, ahead of the scheduled September trial.