Luigi Mangione Pleads Guilty to Federal Charges, Moves to Block New York Murder Trial

Luigi Mangione pleaded guilty Friday to the two remaining federal charges stemming from the killing of UnitedHealthcare CEO Brian Thompson, admitting in court that he traveled to New York intending to shoot the insurance executive. The plea leaves Mangione facing a possible life sentence and has opened a new legal fight over whether New York prosecutors can still try him separately for murder.

The 28-year-old admitted guilt to two federal stalking offenses tied to Thompson's death, one based on interstate travel and the other on the use of interstate facilities. Both charges remained after U.S. District Judge Margaret Garnett dismissed two other federal counts earlier this year.

During the hearing, Mangione acknowledged traveling to New York intending to shoot Thompson and admitted carrying out the killing outside a Manhattan hotel in December 2024. He told Garnett that he knew his actions were illegal.

Mangione entered the guilty pleas without reaching an agreement with federal prosecutors, leaving both sides free to argue over his punishment. U.S. Attorney Jamie McDonald said prosecutors will seek life imprisonment.

The federal plea quickly shifted attention to Mangione's separate New York prosecution. His attorney, Karen Friedman Agnifilo, said the defense had moved to dismiss the remaining state case, arguing that the new federal conviction triggers New York's protections against successive prosecutions. The Manhattan District Attorney's Office has said it will oppose the request, with jury selection in the state case currently scheduled to begin September 8.

The Fifth Amendment generally protects a person from being prosecuted twice for the same offense. Under the U.S. Supreme Court's dual sovereignty doctrine, however, the federal government and a state are treated as separate governments enforcing their own laws. A federal prosecution ordinarily does not prevent a state from bringing its own case over the same conduct.

New York law goes further. Criminal Procedure Law Section 40.20 generally restricts separate prosecutions arising from the same act or criminal transaction, including when the first case was brought in another U.S. jurisdiction. The law contains exceptions, including when the offenses involve substantially different legal elements or are aimed at preventing different kinds of harm.

Another provision addresses when an earlier case counts as a prosecution under those protections. Criminal Procedure Law Section 40.30 includes a conviction based on a guilty plea, giving Mangione's attorneys a new basis to argue that New York cannot prosecute him again over the same criminal episode.

Until Friday, the federal and state cases had been moving forward at the same time. Mangione now has a federal conviction arising from the conduct surrounding Thompson's death. His attorneys argue that the conviction bars the state case, while Manhattan prosecutors maintain that the remaining murder and weapons charges are legally distinct enough to proceed. A state judge will have to decide whether New York's general prohibition applies or whether the prosecution falls within one of its exceptions.

Federal stalking law can apply when someone crosses state lines with the intent to kill, injure, harass, or intimidate another person and then engages in conduct prohibited by the statute. It also covers certain conduct carried out through interstate communications or other interstate facilities. When a death results, the offense can carry a sentence of any term of years or life.

Mangione initially faced four federal charges. Garnett dismissed the murder and related firearms counts in January after finding that the stalking offenses could not qualify as the required crime of violence under the federal law prosecutors had relied on. The ruling removed the possibility of the death penalty while leaving the two stalking charges intact.

Thompson, 50, was shot outside a Midtown Manhattan hotel on December 4, 2024, shortly before UnitedHealth Group's investor conference. Mangione was arrested five days later in Altoona, Pennsylvania, following a multistate search.

Federal prosecutors had prepared to present surveillance footage, physical evidence, DNA evidence and writings they said connected Mangione to the killing before he changed his plea. Thompson's family attended Friday's hearing and later described the plea as a step toward justice, saying they want his sentence to reflect the seriousness of the crime.

Mangione is scheduled to be sentenced in federal court on December 18, 2026.