Everything to Know About the Luigi Mangione Case So Far

Luigi Mangione, the 28-year-old man charged with the December 2024 murder of UnitedHealthcare CEO Brian Thompson, pleaded guilty to two federal stalking charges—one count of interstate stalking resulting in death and one count of cyberstalking through interstate facilities resulting in death—on August 14, 2026. The case has drawn extraordinary public attention and sparked widespread debate about violence, health care and the criminal justice system.

Though Mangione only pleaded guilty to the stalking charges, federal prosecutors had also charged him with murder through the use of a firearm and a separate firearm offense. Both of those charges were dismissed by Judge Margaret Garnett of the U.S. District Court for the Southern District of New York because she felt limited by Supreme Court precedents, saying the charges were legally “incompatible” with the two stalking charges he faced.

New York state prosecutors had additionally charged Mangione with murder, criminal possession of a weapon and stalking. He has pleaded not guilty to all charges in the state case, which also carries the possibility of a life sentence.

Shortly after his federal guilty plea, lawyers for Mangione filed a motion in state court arguing that the New York case against him should be dismissed because of a legal principle known as double jeopardy, accusing the state and federal prosecutors of “trying to punish him twice for the exact conduct.” 

"New York law does not permit a person to be prosecuted and punished twice for the exact same crime under a statute that governs successive prosecutions," his attorney, Karen Friedman Agnifilo, said. "Today's guilty plea triggers this statute, and we just filed our motion in state court explaining why the state charges must be dismissed under New York's double jeopardy protections."

Three days after the motion was filed, Judge Gregory Carro issued an order that indefinitely postponed the September 8 beginning of the state trial. Carro’s order gave prosecutors until October 9 to respond to the double jeopardy claims; Carro will decide at a hearing on December 10 on how to handle the state case after that.

Meanwhile, Mangione is scheduled to be sentenced in the federal case on December 18. 

Federal prosecutors originally wanted to seek the death penalty as directed by then-U.S. Attorney General Pam Bondi, who said Thompson’s killing was “a premeditated, cold-blooded assassination that shocked America” and “an act of political violence.”

However, a judge in February took the death penalty off the table, ruling that in order to seek that punishment, prosecutors had to have shown that Mangione killed Thompson while he was committing another “crime of violence.”

Prosecutors have since said they will ask for a sentence of life in federal prison, though sentencing guidelines call for a term of 24 to 30 years. The Federal Bureau of Prisons will determine where Mangione will serve his federal sentence. He has been held since December 9, 2024, at Metropolitan Detention Center in Brooklyn, where a former inmate, Linus Fu, told Courthouse News that Mangione is akin to a celebrity. 

“Most people, they know Luigi,” Fu said. “Some people ask for autographs; some people want to talk to him.”  

If Mangione’s attorneys are successful in arguing their double jeopardy claims and getting his state case dropped, it would end a prosecution that has already involved extensive pretrial litigation. The hearings mostly focused on the evidence the state had against Mangione. 

One such hearing centered around Mangione’s backpack, which was searched during his arrest, and whether its search was lawful, and if officers read him his Miranda rights before arresting and questioning him. In May 2026, Carro decided a gun and notebook found in the backpack could be used as evidence in his state trial. 

In the same ruling, Carro also said that prosecutors could not present the other items found in the backpack, including a loaded gun magazine, cellphone, passport, wallet and computer chip, which he said were found during an "improper warrantless search." He also excluded some statements Mangione made to police while he was in police custody but before he was reminded of his right to remain silent.

Other evidence against him included surveillance footage that showed the masked gunman shooting Thompson from behind. Left behind was ammunition that said "delay," "deny" and "depose" written on them, which is a phrase used to describe how insurers avoid paying claims. 

During Mangione’s plea hearing, federal prosecutors said they had an “overwhelming amount of evidence,” including DNA and fingerprints from the scene.

While giving his guilty plea in the federal case, Mangione admitted to killing Thompson. He also said he was “motivated by years of back pain and what he believed was a health insurance system working against him,” according to PBS.

When Mangione learned that the company was holding an investor summit in New York City, he emailed the company and posed as an investor to get information about when and where the meeting would be. Then he traveled to New York more than a week before the shooting to conduct surveillance on locations he thought Thompson would be, including the area surrounding the hotel where Thompson was staying and the venue hosting the conference.

When he announced the state charges, Manhattan District Attorney Alvin Bragg called the killing “a frightening, well-planned, targeted murder that was intended to cause shock and attention and intimidation.”