On December 4, 2024, Brian Thompson, the chief executive of UnitedHealthcare, was killed in Midtown Manhattan as the company prepared to open its annual investor conference in the city. Five days later, police in Altoona, Pennsylvania, about 230 miles to the west, took a 26-year-old man named Luigi Nicholas Mangione into custody. Within two weeks he faced charges in three jurisdictions: a Pennsylvania county court, the state courts of New York and the federal court in Manhattan.
The case became not one prosecution but two, running side by side in Manhattan, each with its own theory of the crime and its own ceiling of punishment. The Manhattan District Attorney charged murder as an act of terrorism, a count that carried mandatory life without parole. The Attorney General of the United States directed federal prosecutors to seek the death penalty. Over the next twenty months the courts pared both cases back. A state judge dismissed the terrorism counts in September 2025. A federal judge dismissed the only count that could carry death in January 2026. On August 14, 2026, Mangione stood in federal court and pleaded guilty, with no agreement from the government, to two counts of stalking resulting in death. He awaits sentence. The state murder charge has not been tried, and he remains presumed innocent of it unless and until a New York jury or court finds otherwise.
Mangione grew up in Towson, in Baltimore County, Maryland. He attended the Gilman School, an all-boys private school in the Roland Park section of Baltimore, and graduated in 2016 as valedictorian of his class. Even before he finished school he was writing software. From 2014 he was a co-founder and lead programmer of a small Baltimore company that made games for mobile devices, and he spent time in robotics research at the Whiting School of Engineering at Johns Hopkins University. From 2016 to 2017 he interned as a programmer with Firaxis Games, a game studio based in Maryland.
In 2016 he enrolled at the University of Pennsylvania in Philadelphia. He joined a fraternity and founded a video game development club that grew to about sixty members. He worked as a teaching assistant and led a recitation committee. In the summer of 2019 he was head counselor in Stanford University's pre-collegiate studies program, a role the university later confirmed. In May 2020 Penn awarded him two degrees. Penn's own confirmation describes an undergraduate degree in mathematics and a master's degree in computer and information science; other accounts describe the first degree as a bachelor of science in engineering.
After Penn he went to work in data engineering and rose steadily. His most recent employer was TrueCar, the automotive pricing company, where he worked as a data scientist; the company has said he left in 2023. In the year before his arrest, friends and family lost touch with him.
The victim had spent decades with UnitedHealthcare and its parent company. He was in New York in early December 2024 for the company's investor conference, and he died in Manhattan on December 4.
For five days the man sought in the death was unidentified. On December 9, 2024, officers of the Altoona Police Department detained Mangione, and prosecutors in both New York cases would later rely on evidence gathered at the time of that arrest.
In Blair County, Pennsylvania, where Altoona lies, he was arraigned on five counts, among them a felony count of forgery and a count of giving false identification to police. He was held in Pennsylvania while New York sought his return, and the Manhattan District Attorney told reporters that he had indications Mangione might not contest extradition. Later in December he was returned to New York.
On December 17, 2024, the Manhattan District Attorney announced that a grand jury had returned an eleven-count indictment. The lead count was murder in the first degree, charged on the theory that the killing had been committed in furtherance of an act of terrorism. A second count charged murder in the second degree as a crime of terrorism. A further count charged murder in the second degree without that element, and eight more counts made up the rest. If convicted on all counts, Mangione faced mandatory life imprisonment without parole.
The District Attorney's office argued that the killing was meant to carry a social and political message to the public, well beyond the death of one man. Mangione pleaded not guilty to the indictment late in 2024.
The federal case opened on December 18, 2024, when an agent of the Federal Bureau of Investigation swore out a sealed complaint before a United States magistrate judge in the Southern District of New York. It charged four counts. Count One charged stalking by travel in interstate commerce, under 18 U.S.C. 2261A(1)(A) and 2261(b)(1), alleging that from about November 24 to about December 4, 2024, Mangione had traveled to New York with the intent to kill, injure, harass and intimidate Brian Thompson and to place him under surveillance, that the travel led to conduct placing Thompson in reasonable fear of death or serious bodily injury, and that in the course of that conduct he caused Thompson's death. Count Two charged stalking through the use of interstate facilities, under 18 U.S.C. 2261A(2)(A) and 2261(b)(1), over the same period. Count Three charged an offense under 18 U.S.C. 924(j), which the complaint tied to murder as defined in 18 U.S.C. 1111(a). Count Four charged an offense under 18 U.S.C. 924(c)(1)(A) and (c)(1)(B)(ii).
Count Three mattered most. Unlike the other three, it allowed the government to seek the death penalty. Counts Three and Four depended on the first two, because Counts Three and Four required that the conduct have occurred during and in relation to a federal "crime of violence," and the complaint named the two stalking offenses as those crimes.
Prosecutors said that the state case was expected to go to trial first.
On April 1, 2025, the Attorney General of the United States announced that she had directed federal prosecutors to seek the death penalty. It was the first time the Justice Department had sought death since the change of administration in January 2025. A federal grand jury in Manhattan returned a four-count indictment on April 17, 2025, mirroring the structure of the complaint: two counts of stalking, one count under section 924(j) and one under section 924(c). On April 25, 2025, Mangione was arraigned in federal court and pleaded not guilty.
The defense attacked the capital case on several fronts. It argued that the decision to seek death had been made for political reasons and had bypassed the Justice Department's own protocols, that public statements by officials before indictment had prejudiced any jury, and that the Attorney General had a conflict of interest. It also asked the court to dismiss Counts Three and Four outright. Prosecutors answered that the murder charge was legally sound and that jurors could be questioned about what they knew of the case.
On September 16, 2025, the state judge presiding over the Manhattan case issued a written decision dismissing the two terrorism counts: "murder in the first degree in furtherance of an act of terrorism" and "murder in the second degree as a crime of terrorism." He found both legally insufficient. The grand jury, he held, had not been given evidence that Mangione intended to intimidate a civilian population, including the employees of health insurance companies, or to influence government policy. He found nothing showing a desire to spread fear through the public at large, a broader campaign of violence or any tie to a terrorist group, and he wrote that the targeted killing of one person differed in kind from the examples the statute's sponsors had in mind. He also observed that terrorism was famously difficult to define and that New York's highest court had warned against stretching the term.
The ruling removed the possibility of mandatory life without parole in state court. The count of murder in the second degree survived, with eight further counts, nine in all, and the District Attorney's office said it would proceed on every one of them. The judge rejected the defense's request to dismiss the whole state case on double jeopardy grounds, calling it premature because neither case had reached trial. He set hearings on the defense's motions to suppress evidence and statements for December 1, 2025.
The state hearing ran for three weeks in December 2025. The defense asked the state judge to exclude evidence gathered at the time of the arrest, and the judge said he would rule in the spring.
On January 9, 2026, the federal judge heard argument on the motions in her own case. The defense contended that stalking, as Congress defined it, was not a crime of violence, and so could not serve as the predicate for either Count Three or Count Four. Three weeks later, on January 30, 2026, the federal judge dismissed both counts. Stalking, she held, could be committed without the use or threatened use of force, and a crime of violence must involve force. She acknowledged that the conduct alleged in the case was violent, and she acknowledged that her conclusion might seem strange, but she held that the Supreme Court's approach required her to analyze the offense in a way that was entirely separate from the facts of any individual case. With Counts Three and Four gone, the death penalty was no longer available. The two stalking counts remained, each carrying a maximum of life in prison without parole.
In the same decision she refused to suppress the evidence taken from Mangione when he was arrested in Altoona, finding that it fell within several recognized exceptions to the warrant requirement, among them inevitable discovery.
Federal prosecutors had until February 27 to decide whether to appeal the dismissal. That day the Justice Department told the court in a letter that it would not seek interlocutory review of the order. The capital case was over.
For months the two courts circled one another. On January 30 the federal judge said that the state case would not alter her schedule, at least for the time being. At the end of January the federal court planned jury selection for September 8, 2026, and opening statements for October 13. The District Attorney's office pressed for a state trial to begin first, and a June date was set in state court. In early April the state judge moved the state trial to September 8, and on April 2, 2026, the federal judge moved her own trial to January 2027, with jury selection set for January 5 and opening statements for January 25. She said that the federal court was, whether it liked it or not, somewhat at the mercy of events in the state case.
The schedule never reached either jury. On Friday, August 14, 2026, Mangione appeared before the federal judge in Manhattan and pleaded guilty to both remaining counts of stalking resulting in death. It was an open plea, entered without any agreement and without concessions from the government. Before the plea was formally entered, his lawyers told the court they had no viable defense. In his allocution Mangione admitted that he had followed Brian Thompson to the company's investor conference and had killed him in Manhattan in December 2024, and he told the court that he had known his conduct was illegal.
The United States Attorney for the Southern District of New York said afterward that Mangione now stood convicted in federal court and faced life in prison. Prosecutors said they would ask for a life sentence. The federal sentencing guidelines, which are advisory, call for a term of 24 to 30 years. Sentencing was set for December 18, 2026.
Immediately after the plea, the defense moved to dismiss the state case. New York law bars a state prosecution for the same criminal transaction once a federal case arising from that transaction has ended in a guilty plea or reached the point at which a jury is sworn, subject to exceptions that the courts apply case by case. The defense argued that the federal stalking counts and the state murder charge rested on the same conduct and called their client a pawn in parallel prosecutions.
The District Attorney's office said it would fight the motion. It argued that the state charges carried different legal elements and covered different criminal conduct, and it pointed to the state's interest in what it called the sanctity of life principle underlying its homicide charges. It also noted that the federal sentence was not yet known. In July an assistant district attorney had written that any plea in the case must account for the seriousness of the offenses.
On Monday, August 17, 2026, the state judge canceled the trial set for September 8. He gave prosecutors until October 9 to answer the defense motion and scheduled a hearing for December 10, 2026, about a week before the federal sentencing. Whatever he decides may be appealed by the losing side.
As of November 13, 2026, Mangione stands convicted in federal court of two counts of stalking resulting in death and awaits sentencing on December 18, 2026, when he faces a maximum of life imprisonment. The New York State charge of murder in the second degree, with eight further counts, is pending and untried, and he is presumed innocent of those charges. He has been held in custody since his arrest in December 2024 and is detained in New York.
Two bodies of law decided the shape of this prosecution, and each turned on a definition.
The first was New York's terrorism statute, Article 490 of the Penal Law, which the legislature passed six days after the attacks of September 11, 2001. It requires that a defendant intend to intimidate or coerce a civilian population, or to influence or affect the conduct of a unit of government by intimidation, coercion, murder, assassination or kidnapping. The sponsors of the bill had pointed to mass-casualty attacks and political murders as the kinds of acts the statute was written for. The state judge relied on that history when he held that the killing of one targeted man, without more, did not meet the statute's definition on the evidence before the grand jury.
The second was the federal definition of a "crime of violence" used in 18 U.S.C. 924(c) and (j). Federal courts decide whether an offense qualifies by examining the elements of the offense in the abstract, not the facts of the particular case. Because federal stalking can be committed without force, the federal judge held that it could not serve as a predicate, even where, as here, a death had resulted. That reading ended the only path to a federal death sentence in the case.
Mangione has admitted, under oath and in federal court, that he followed the victim and caused his death. That admission is the basis of his federal conviction. He has not been convicted of murder in either court. The federal murder count under section 924(j) was dismissed before trial and never tested, and the state charge of murder in the second degree remains untried.
The state's theory that the killing was an act of terrorism was rejected by the state court as legally insufficient on the grand jury evidence, and it is no longer part of any charge.
The defense claim that the state and federal prosecutors coordinated their cases in a way that evaded double jeopardy protections is disputed by the prosecution and is before the state court.
The defense argument that the decision to seek death was political was never decided, because the capital counts were dismissed on other grounds.
2016: Graduates as valedictorian of the Gilman School in Baltimore; enrolls at the University of Pennsylvania.
May 2020: Receives two degrees from the University of Pennsylvania.
2023: Leaves his job as a data scientist at TrueCar.
November 24 to December 4, 2024: Period of the stalking offenses charged in federal court.
December 4, 2024: Brian Thompson, chief executive of UnitedHealthcare, dies in Midtown Manhattan.
December 9, 2024: Mangione is detained in Altoona, Pennsylvania, and charged in Blair County; the Manhattan District Attorney files a murder complaint.
December 17, 2024: A Manhattan grand jury returns an eleven-count indictment, including two terrorism counts.
December 18, 2024: A federal complaint charges four counts in the Southern District of New York.
Late December 2024: Returned to New York; pleads not guilty to the state indictment.
April 1, 2025: The Attorney General directs federal prosecutors to seek the death penalty.
April 17, 2025: A federal grand jury returns a four-count indictment.
April 25, 2025: Pleads not guilty in federal court.
September 16, 2025: The state court dismisses both terrorism counts; nine counts remain, including murder in the second degree.
December 2025: Three weeks of state suppression hearings.
January 30, 2026: The federal court dismisses Counts Three and Four, ending the capital case, and refuses to suppress evidence from the arrest.
February 27, 2026: The Justice Department says it will not seek review of the dismissal.
April 2, 2026: The federal trial is moved to January 2027; the state trial is set for September 8, 2026.
August 14, 2026: Pleads guilty in federal court, without an agreement, to two counts of stalking resulting in death.
August 17, 2026: The state trial is canceled pending a double jeopardy motion.
October 9, 2026: Deadline for the prosecution's answer to the double jeopardy motion.
December 10, 2026: State hearing on the double jeopardy motion (scheduled).
December 18, 2026: Federal sentencing (scheduled).