Who Is Luigi Mangione? What We Know About UnitedHealthcare CEO Shooting Suspect

Five days after UnitedHealthcare CEO Brian Thompson was fatally shot outside of a Manhattan hotel, police identified Luigi Mangione as the primary suspect.

On Dec. 9, Mangione, 26, was apprehended at a McDonald’s in Altoona, Pa., after an employee reported his suspicious behavior. Police allegedly found a gun resembling the one used by Thompson’s shooter, a silencer, a fake New Jersey ID used to book a stay at an Upper West Side hostel and a three-page “manifesto” in the suspect’s possession, police sources told PEOPLE.

Thompson was shot three times by a masked gunman early on Dec. 4 as he arrived at the Hilton Hotel in Midtown Manhattan. The gunman fled on an electric Citi Bike and disappeared into Central Park, avoiding police and prompting a $10,000 reward for information leading to his capture. Thompson was transported to Roosevelt Hospital, where he was pronounced dead.

Detectives reportedly found the words “deny,” “defend” and “depose” on the shell casings found at the scene, police sources told ABC News. The words are similar to “Deny, delay, defend,” a phrase about the insurance industry to describe a strategy for rejecting claims. However, a motive has yet to be established.

Here’s everything to know about Luigi Mangione.

He was born and raised in Maryland

According to NYPD Chief of Detectives Joseph Kenny, Mangione was born and raised in Maryland. Although his last known address was in Hawaii, he also has ties to San Francisco.

Mangione was a high school valedictorian

Mangione graduated as valedictorian from Gilman School, an all-boys independent institution in Baltimore, per his LinkedIn.

He received bachelor’s and master’s degrees from the University of Pennsylvania

A spokesperson for the university confirmed to PEOPLE that Mangione graduated from the University of Pennsylvania in 2020 with a bachelor’s and master’s degree in engineering, computer and information science.

Before starting his final year at the University of Pennsylvania, Mangione worked as an artificial intelligence teaching assistant at Stanford University in the summer of 2019.

He is a data engineer

Mangione has been working as a data engineer at TrueCar, Inc., an automotive retail website based out of Santa Monica, Calif., since November 2020, per his LinkedIn.

He is the suspect in the fatal shooting of UnitedHealthcare CEO Brian Thompson

On Dec. 9, Mangione was identified and detained as the primary suspect in the fatal shooting of UnitedHealthcare CEO Thompson, which occurred five days earlier.

Thompson was arriving at the Hilton Hotel in Midtown Manhattan just before 6:45 a.m. on Dec. 4 when a masked gunman shot him in the chest, in what police deemed a “targeted” attack.

NYPD Commissioner Jessica Tisch said in a press conference that day that the gunman had been “lying in wait for several minutes,” before he shot Thompson at least three times. (The New York Times reported that the unidentified gunman had known which door the CEO was going to enter.)

The suspect then got on an electric Citi Bike and fled toward Central Park. With him on the loose for several days, police had been offering a $10,000 reward for any information leading to his capture.

Mangione was detained while at McDonald’s

Mangione was found on Dec. 9 in a McDonald’s in Altoona, after an employee recognized him, per police.

He was allegedly found with a gun resembling the one used by Thompson’s shooter, along with a silencer and a fake New Jersey ID that police claim he used to book a stay at an Upper West Side hostel where the shooter is believed to have stayed. The name the suspect used on his fake ID was Mark Rosario, according to the source.

He had a “manifesto” against healthcare companies with him

A law enforcement source told PEOPLE that Mangione had a three-page manifesto — which was critical of the healthcare insurance industry — on his person when he was detained.

During a Dec. 9 press conference, NYPD Commissioner Jessica Tisch said “officers recovered a handwritten document that speaks to both his motivation and mindset.”