Defense team argues federal plea blocks state murder trial

Luigi Mangione’s legal team submitted a court filing on Friday arguing that a federal guilty plea bars state prosecutors from trying him for murder. The defense contends that Mangione has already been punished for the 2024 killing of UnitedHealthcare CEO Brian Thompson.

In August, Mangione pleaded guilty to federal stalking charges. During that process, he admitted to traveling to New York with the intent to kill Thompson and firing the weapon outside the Midtown Hilton. Defense attorney Karen Agnifilo wrote that the state murder trial would constitute double jeopardy because the core conduct is identical.

Agnifilo stated that no known case exists where federal authorities prosecuted specific actions against a specific victim, and state authorities then prosecuted that same conduct. She emphasized that New York law does not allow a person to be punished twice for the exact same crime under a statute governing successive prosecutions.

The Manhattan District Attorney’s office maintains that the federal stalking charge and the state murder charge address different misconduct. The defense filing counters that while stalking can cover less extreme behavior, it also applies to intentional killing. The filing asserts that the specific facts of this case make the two charges effectively the same.

Judge Gregory Carro is scheduled to hear oral arguments on the defense motion to dismiss the state indictment in December. That same month, Mangione will be sentenced for his federal charges. The Manhattan District Attorney’s office did not immediately comment on the new filing.

The legal battle centers on whether the federal plea exhausts the state’s interest in prosecuting the shooting. The defense relies on the fact that the victim, the weapon, the location, and the time were all identical in both proceedings.