Luigi Mangione pleads guilty in federal case over UnitedHealthcare CEO killing

The plea resolves his federal case but could raise new legal questions for the state prosecution scheduled for next month.

Luigi Mangione, 28, pleaded guilty Aug. 14 in Manhattan federal court to charges of stalking Brian Thompson with the intent to kill him. The plea resolves the federal case for now but could have major consequences for the separate state murder case scheduled to begin next month.

Thompson, 50, was fatally shot on Dec. 4, 2024, outside a Manhattan hotel as he headed to UnitedHealthcare‘s annual investor conference. Surveillance footage showed a masked gunman approaching Thompson from behind before opening fire. As reported by WESH2, the killing quickly became more than a high-profile murder investigation. Details investigators uncovered including the words “delay,” “deny” and “depose” reportedly written on ammunition fueled a wider debate over the U.S. health insurance industry.

Luigi Mangione was arrested five days after the shooting at a McDonald’s in Altoona, Pennsylvania, roughly 230 miles west of Manhattan. Police and UnitedHealthcare said he was never a customer of the company. Friday’s plea resolves one of the two criminal cases brought against Mangione. He still faces state murder charges in New York, with a trial currently scheduled for next month.

Luigi Mangione’s attorneys have argued that forcing him through separate federal and state prosecutions over the same underlying conduct could amount to double jeopardy. Under New York law, a state prosecution can potentially be barred when a federal prosecution involving the same conduct ends with a guilty plea. State prosecutors previously objected to the possibility that a federal plea could interfere with their murder case.

The legal question now becomes whether the federal guilty plea prevents New York prosecutors from proceeding with their case. Mangione’s federal prosecution had already been narrowed after a judge dismissed additional charges that could have exposed him to the death penalty. Federal prosecutors had accused Mangione of stalking Thompson as part of a plan to cause his death.

The defense has also faced setbacks during the proceedings. In January, U.S. District Judge Margaret M. Garnett ruled that prosecutors could use evidence recovered from Mangione’s backpack following his arrest, including a 3D-printed pistol investigators said matched the weapon used in Thompson’s killing and a notebook. Luigi Mangione’s lawyers briefly indicated in June that they would pursue a psychiatric defense in the state case before withdrawing that strategy a day later.