Luigi Mangione, 26, was arrested on Monday, December 9, in Altoona, Pennsylvania and identified as the person involved in the shooting of UntiedHealthcare CEO Brian Thompson.

Mangione was apprehended five days after Thompson was killed outside the New York Hilton Midtown in New York City in the early morning of December 4th. Despite being designated a person of interest, he has not yet been arrested or formally charged in connection with Thompson’s death. (However, he was arrested on a firearms charge in Altoona.)

New York City Police Department detectives are reportedly traveling to Altoona to further question Mangione. If he is to be charged in Thompson’s death, he must first be extradited to New York.

Details about Mangione are still unknown, but here’s everything we know so far about the person of interest, as well as Thompson’s death.

“Pre-planned, targeted”

Authorities described Thompson’s killing as a “pre-planned, targeted attack.” The shooting occurred around 6:45 a.m. when the suspect fired several bullets at Thompson, hitting him in the back and leg. Three live cartridges and three fired cartridge cases were recovered by police from the scene. The 50-year-old was pronounced dead after being transported to a nearby hospital.

Immediately after the shooting, authorities said the suspect fled the scene, first on foot, then on a bicycle, and quickly left New York City by bus (surveillance cameras caught him entering the Port Authority Bus Terminal, but not leaving). Police officers also recovered a backpack in Central Park reportedly filled with Monopoly money that they said belonged to the shooter.

During the manhunt, police shared a handful of photos of the suspected shooter taken from surveillance footage. These included images of the shooter in a Starbucks and in a taxi, although his face was obscured in both images. Images of the shooter without a face mask were taken at the Manhattan hostel where he was reportedly staying.

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ID card in Altoona

It was these images that apparently led to Mangione’s identification in Altoona. At a press conference on Monday, December 9, New York Police Commissioner Jessica Tisch said Mangione was recognized by a McDonald’s employee who then called police.

When officers arrived at the scene, Tisch continued, they questioned Mangione, who they said was acting “suspicious.” Police discovered that Mangione was “carrying multiple fake IDs” — including a fake New Jersey ID that matched the one the suspect allegedly used to check into his New York hostel. Tisch also said officers recovered a face mask similar to the suspect’s, as well as a gun and silencer “both consistent with the weapon used in the murder.”

At the press conference, NYPD Chief Detective Joseph Kenny said they believed the Mangione was a “ghost gun.” These are firearms made from parts and DIY kits purchased online and then assembled at home, making them untraceable. Kenny said Magnione’s gun was capable of firing a 9mm cartridge and suggested the gun may have been made using a 3D printer.

Finally, Mangione had a handwritten manifesto that Tisch said spoke to his “motivation and mindset.”

Who is Luigi Mangione?

Mangione’s biography is still being worked on, although Kenny has revealed a few details. He said Mangione was born and raised in Maryland, has ties to San Francisco and recently lived in Honolulu.

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Mangione attended Gilman School, a private all-boys school in Maryland, where he wrestled and graduated at the top of his class in 2016. The University of Pennsylvania confirmed that Mangione earned his bachelor’s degree there in 2020—he majored in computer science and minored in mathematics—and a master’s degree in engineering (via The New York Times).

As for his ties to San Francisco, Stanford University confirmed that Mangione served as senior advisor in the school’s Pre-Collegiate Studies Program between May and September 2019. For a time, Mangione worked at TrueCar, an automobile pricing and reviews website; This was confirmed by a company spokesman Rolling Stone that he has not worked there since 2023.

Mangione has no criminal record in New York and Kenny said authorities believed he acted alone.

The manifesto

Early reports said Mangione was carrying a handwritten manifesto criticizing healthcare companies and the way they put profits over patient care. The full contents of the document have not yet been released, although a law enforcement official provided CNN with two quotes: “These parasites had it coming” and “I apologize for the hassle and trauma, but it had to be done.”

Speaking about the manifesto at the press conference, Kenny said the document remains in the possession of Altoona police as part of their investigation. He added: “After just a short conversation with them, we don’t believe there are any specific threats to anyone else mentioned in this document. “But it does appear that he has some antipathy toward the American economy.”

That would potentially match one of the most striking pieces of evidence at the crime scene: bullet casings engraved with the words “deny,” “defend” and “depose,” a possible allusion to terms used by health insurance companies that pay claims to avoid.

The publication of Mangione’s name revealed several social media accounts that share his name, as well as some appropriate biographical details. (For example, a Twitter account for a Luigi Mangione includes his college transcripts: “MSE and BSE in Computer Science @ Penn.”)

Of note, the header photo for this Twitter account appears to include an X-ray of a person’s back, possibly with a lumbar spine fusion. This is a surgery that joins bones in the spine, preventing movement to relieve pain (according to the Mayo Clinic). Additionally, a Goodreads account believed to belong to Mangione reveals that he has logged several books on the topic of chronic back pain.

But perhaps the most eye-catching book logged into this Goodreads account was Industrial society and its future – also known as Unabomber Ted Kaczynski’s manifesto. “It is easy to quickly and thoughtlessly dismiss this as a madman’s manifesto to avoid confronting some of the unpleasant issues it identifies. But it is simply impossible to ignore how prescient many of his predictions about modern society were,” Mangione wrote in his review.