What comes next after Luigi Mangione pleads guilty to federal charges in killing of UnitedHealthcare CEO

By Kara Scannell, Nicki Brown, Lauren del Valle, CNN

(CNN) — More than a year after the fatal shooting of UnitedHealthcare CEO Brian Thompson, 28-year-old Luigi Mangione confessed to the killing in his own words as he pleaded guilty to federal charges in court Friday – a move that raises questions about the future of his upcoming state murder trial.

“On the morning of December 4, 2024, I shot Mr. Thompson in Manhattan and he died,” Mangione said as he sat in a federal courtroom flanked by his defense attorneys. He spoke calmly – and expressed no remorse for murdering the 50-year-old healthcare executive and father of two as Thompson’s family members, including his widow, sat in the front row of the courtroom and held one another.

The change of plea is a stunning development in a case that has captured national attention and exposed deep-seated frustration with the American healthcare system, as Mangione amassed a horde of devoted followers who sympathized with his cause and held him up as a kind of folk hero.

Mangione faced both state and federal charges: His guilty plea staves off his federal trial on two stalking charges, which had been scheduled for January 2027. But the fate of Mangione’s state case, set to go to trial next month, now hangs in the balance as his attorneys seek to get second-degree murder and weapons charges dismissed over double jeopardy protections.

A legal showdown that will likely delay the state trial is sure to follow, as the Manhattan District Attorney’s Office signaled Friday it would fight to see its prosecution proceed.

Whether it does remains to be seen, but legal experts said Mangione’s defense has a strong argument that could see most of the state charges dismissed under New York state’s double jeopardy law, which goes further than the US Constitution in prohibiting two prosecutions based on the same criminal act or conduct.

“I think it’s more likely than not that the state case goes away with the federal guilty plea,” said Anthony Capozzolo, a former prosecutor with the Manhattan District Attorney’s Office and a former federal prosecutor with the Eastern District of New York.

Capozzolo expects New York prosecutors will be blocked from moving ahead “because it’s likely both offenses will be punishing someone for the murder of the same victim and the elements of the federal and state cases are punishing the same harm or evil.”

“Therefore, the offenses will not be deemed different enough to allow New York to continue to prosecute the case,” he said.

Mangione’s guilty plea in the federal case came during a conference which was hastily scheduled hours after he appeared in state court earlier this week to discuss the upcoming trial. CNN reported this week Mangione’s defense attorneys were in plea negotiations with federal prosecutors – although his defense attorneys confirmed in court Friday no agreement was reached.

US Judge Margaret Garnett set Mangione’s sentencing for December 18. He faces a maximum sentence of life in prison; if the DA’s office is satisfied with his federal sentence, it could agree to dismiss the state charges.

The murder of Brian Thompson

For the first time Friday, Mangione publicly described Thompson’s killing in his own words, detailing the steps he took to plan the shooting outside a Midtown Manhattan hotel hosting UnitedHealthcare’s annual investor conference. Mangione spoke quickly, prompting the judge to interrupt him because she was having trouble hearing.

“After years of enduring severe pain from a broken back, navigating the obstacles of the health insurance system and witnessing similar experiences of countless others, I learned that UnitedHealthcare would be holding its annual investor conference in New York City on December 4, 2024,” Mangione said, adding the conference would be attended by investors and executives but not medical providers or patients.

Mangione used a 3D printer to create part of a firearm, he said, which he equipped with a silencer and magazine before travelling to New York City in November 2024.

“I then emailed UnitedHealthcare leadership, posing as an investor at a firm managing over $50 billion in assets and requesting information about the conference,” Mangione said. “Unlike my previous interactions with insurers, I received an immediate response within an hour.”

Reading a prepared statement with little emotion, Mangione described shooting Thompson: “When I did so, I understood that my actions would place him in fear of death or serious bodily injury. I knew what I was doing was illegal.”

He did not look at Thompson’s family.

Will Mangione’s state trial go forward?

Thompson’s killing outside a Midtown Manhattan hotel ignited a multistate manhunt that ended five days later, when police in Altoona, Pennsylvania, arrested Mangione in a McDonald’s.

In his backpack, authorities said, they found a gun that linked him to the crime scene and a notebook that included writings about targeting the CEO at the “parasitic bean-counter convention” – strong evidence experts previously told CNN would narrow his defense options at trial.

Mangione’s lawyers raised concerns when he was first charged in both jurisdictions that the 28-year-old was unfairly being tried twice for the same crime. Since then, the prospect of double jeopardy has remained an open question that’s come up several times during open court proceedings and in filings.

Immediately following the federal hearing Friday, Mangione’s defense team filed a motion asking New York Judge Gregory Carro to dismiss second-degree murder and weapons charges in his state case, Karen Friedman Agnifilo told reporters outside the federal courthouse Friday.

“It was a single tragic event, yet he’s being prosecuted twice for the same conduct,” she told reporters.

“Thankfully, New York law does not allow this,” Friedman Agnifilo said. “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.”

In its filing, the defense asked the state judge to dismiss the charges, accusing federal and state prosecutors of coordinating their cases “to maximize the punitive effectiveness of the two cases at the expense of Mr. Mangione.”

Mangione’s defense claimed state and federal prosecutors cut a deal to allow the state case to proceed first in an effort to evade double jeopardy protections and give both offices an opportunity to prosecute Mangione, violating the killer’s constitutional rights.

“This coordinated deal between them had a specific purpose: The scheme was designed solely to ensure dual successive prosecutions, in order to attempt to avoid double jeopardy protections,” the filing said.

The Manhattan District Attorney’s Office acknowledged Mangione’s motion to dismiss the state charges Friday afternoon but said it was ready to fight for its case in court.

“We are encouraged that Mr. Thompson’s family received a measure of accountability today. While federal sentencing is pending, we are prepared to litigate the defense motions. The Manhattan D.A.’s Office remains committed to seeking justice for Mr. Thompson and his family,” a spokesperson said.

Carro now must consider whether to allow the trial to move forward on all eight charges Mangione presently faces in the indictment. He could delay the September 8 start of jury selection while the parties argue in court filings – or even wait for the federal sentencing to play out before deciding.

Either side could appeal Carro’s decision, which would likely further delay a possible state trial – if it proceeds at all.

New York legal experts have suggested state prosecutors are unlikely to see a trial against Mangione now that he’s resolved the federal case.

“I do believe that based upon the law that the state trial goes away. I do think that this double jeopardy argument is real,” CNN legal analyst and criminal defense attorney Joey Jackson said, because both cases involve “the same sort of transaction and occurrence, the same set of facts,” and the same “evil” that is “eradicated” by Mangione’s plea Friday.

Stacy Schneider, a New York City criminal defense attorney, told CNN’s Jake Tapper Mangione’s defense has a “calculated, good shot” at getting the state case dismissed, “but not a slam dunk.”

“They want to invoke the New York state double jeopardy law, which is a broad law, and says not only can you not prosecute them for the same act – but you can’t prosecute them for the same act or criminal transaction, even though it’s two different offenses,” she said.

Prosecutors, meanwhile, will likely argue “the act of stalking was a prelude to the murder,” Schneider said, and that the acts encompassed by the federal charges are “not the same as actually pulling the trigger.”

Mangione believes healthcare system ‘destroyed his life,’ attorney says

Whatever happens with the state case, experts said, Mangione will also likely be looking ahead to his sentencing in December, when he will have another opportunity to address the court.

His attorneys will likely present what’s known as mitigating evidence, which the judge would weigh in determining his sentence.

After Friday’s court appearance, Mangione’s defense attorney said Mangione has “accepted full responsibility” for Thompson’s death, calling Friday a “solemn and significant day.”

“As Luigi explained in court today, he endured years of severe, debilitating pain following a broken back while struggling to navigate our healthcare and health insurance systems,” Friedman Agnifilo said outside the courthouse. “Like the thousands of people who have reached out since this tragedy to share their own experiences, he believed that the system had failed him and destroyed his life.”

In a statement, Thompson’s family called the guilty plea “an important step toward justice,” and noted Mangione’s pending cases in New York and Pennsylvania state court. The latter case involves charges stemming from his arrest.

“While nothing will ease the pain of losing him, we are grateful that the federal justice system has held the person responsible for this heinous act accountable,” the Thompson family said in their statement. “Now we look to the court to ensure that sentencing reflects the severity of this crime.”

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CNN’s August Phillips contributed to this report.