He has not been charged with the killing of Mr Thompson, officials said on Monday.
Detectives from the New York City Police Department (NYPD) have travelled to Pennsylvania to question Mangione.
Here’s what we know about him so far…
Arrest
According to officials from the NYPD, Mangione was arrested in Altoona on Monday after a tip-off from a McDonald’s employee who recognised him from the police appeals.
Image: Luigi Mangione, 26, was found at a McDonald’s, after a worker recognised him and called the police
Altoona is around 230 miles to the west of New York and in the state of Pennsylvania.
According to police, he had a silencer and a gun “both consistent with the weapon used in the murder”.
They said the gun appeared to be a “ghost gun” – a type of weapon that can be assembled at home from parts and without a serial number – and that it was possibly made using a 3D printer.
Mangione also had a fake New Jersey ID – with the name Mark Rosario – matching a document used by the suspect to check into a hostel in the city before the attack, NYPD Commissioner Jessica Tisch told a press conference on Monday.
Image: Luigi Mangione had a fake New Jersey ID
He was found carrying a “handwritten document” which Ms Tisch said spoke “to both his motivation and mindset”.
NYPD chief of detectives Joseph Kenny said that from the document, it appeared the suspect had “some ill-will towards corporate America”.
Background
According to police, Mangione was born and raised in the state of Maryland and has links to San Francisco in California and Hawaii’s capital Honolulu.
His social media lists him as being from Towson, a well-to-do area to the north of the city of Baltimore. He is said to have attended Gilman school – a private all-boys school in the city.
Image: Luigi Mangione Pic: LinkedIn
Fees cost up to $37,000 (£29,000) depending on the age of the student and the school boasts an impressive list of alumni, including businessmen, NFL stars and former state senators.
After graduating in 2016, it appears Mangione went on to attend the University of Pennsylvania.
According to his social media, he studied computer science and during his time there launched a gaming research group named UPGRADE (UPenn Game Research and Development Environment).
He later co-founded his own computer game company, which focused on small, simplistic games.
According to his LinkedIn page, Mangione moved to California in 2020, where he worked for a digital retailing website for new and used cars.
Magione lists himself as from Honolulu on his LinkedIn page, while pictures shared on his public Instagram page show him on the island of Hawaii.
What about his social media presence?
Mangione appears to have an active social media presence.
One account, appearing under his name and picture on the X platform, regularly shares and reposts think pieces, with frequent topics such as artificial intelligence (AI), philosophy, and the future of humanity in a world of ever-more powerful technology.
Image: Luigi Mangione. Pic: Facebook
The account praised the book What’s Our Problem? by the popular American author Tim Urban – who often addresses such topics – in January 2024 saying he “believed it would go down in history as the most important philosophical text of the early 21st century”.
While the account does address political issues, it seemingly does not express views on the American healthcare and insurance system.
In another account matching his name and photograph on the user-generated book review site Goodreads, he appeared to give a four-star review to a text called Industrial Society and Its Future by Theodore Kaczynski.
The piece, which rallied against technological advancement, became known as the Unabomber Manifesto after its author began a nearly 20-year mail bombing campaign which he said was designed to protect nature.
Three people were killed and dozens others injured in the bombing campaign, which ended with his arrest in 1996.
In the review, the account seemingly run by Mangione wrote: “When all other forms of communication fail, violence is necessary to survive. You may not like his methods, but to see things from his perspective, it’s not terrorism, it’s war and revolution.
“‘Violence never solved anything’ is a statement uttered by cowards and predators.”
Brian Thompson shooting
Brian Thompson, 50, was the chief executive of UnitedHealthcare – the fourth-largest public company in the United States.
Image: Chief Executive Officer of UnitedHealthcare Brian Thompson.
Pic: Business Wire/AP
He was targeted by what experts claim was a “seasoned, professional killer”, who shot him on 4 December as he was walking into a Manhattan hotel where his company was holding a conference.
Investigators said last week the words “defend”, “deny”, and “depose” were written on the cases of bullets found at the scene, which are similar to the title of a book that criticises health insurance companies.
The shooting happened at 6.45am on Wednesday 4 December – just before sunrise.
Mr Thompson was in New York City for UnitedHealthcare’s annual investors conference, which was due to start at 8am.
Image: Police shared this picture of the suspect following the shooting. Pic: NYPD
As he walked towards the entrance of the Hilton hotel on Sixth Avenue, in Manhattan’s midtown, a gunman appeared from two parked cars behind him.
The suspect drew his weapon and fired at least three times at close range – around 15ft (4.6m) away from him on the pavement.
Mr Thompson was shot in the back and the calf and died from his injuries.
Image: A police officer stands near the scene where the CEO of United Healthcare Brian Thompson was shot. Pic: Reuters
UnitedHealthcare is the largest provider of Medicare Advantage plans in the US and manages insurance for employers and state and federally funded programmes.
It is the fourth largest public company in the country – behind Walmart, Amazon, and Apple.
The suspect accused of shooting dead right-wing influencer Charlie Kirk was in a romantic relationship with his transgender roommate, Utah’s governor has said.
Tyler Robinson, 22, from Washington in Utah, is due to appear in court on Tuesday after Kirk, 31, was killed during one of his rallies at Utah Valley University on Wednesday.
Robinson is being held without bail on suspicion of aggravated murder, a felony discharge of a firearm causing serious bodily injury, and obstruction of justice.
According to Utah’s Republican governor, Spencer James Cox, he was in a relationship with his roommate – who was in the process of transitioning.
“The roommate was a romantic partner,” he told NBC News’s Meet The Press on Sunday. “We can confirm that that roommate is a boyfriend who is transitioning from male to female.”
He added that the roommate has been “incredibly cooperative” and had “no idea that this [the shooting] was happening”, but that Robinson has not been cooperating with police.
Image: Charlie Kirk at Utah Valley University before he was shot. Pic: AP
Kirk, who co-founded the conservative student movement Turning Point USA, regularly expressed anti-LGBTQ views.
The motive of the shooting is unclear, and officials have not said whether Robinson’s relationship – or his roommate’s gender – is relevant to their investigation.
Authorities are still trying to get access to cloud storage linked to Robinson, according to NBC.
Mr Cox has previously said the suspect came from a “conservative family, but his ideology was very different than his family”, adding in an interview with The Wall Street Journal that he had been “deeply indoctrinated with leftist ideology”.
According to the governor, his relatives have said Robinson was critical of Kirk, saying he was “full of hate and spreading hate” and “talked about why he didn’t like him and the viewpoints that he had”.
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0:37
Security camera shows Charlie Kirk suspect
The 22-year-old is due to be charged when he makes his first court appearance on Tuesday, according to the Utah County attorney’s office.
He was in his third year of an electrical apprenticeship programme at Dixie Technical College in St George, Utah, NBC reported.
A spokesperson for Utah Valley University, where Kirk was speaking when he was shot in the neck, said Robinson studied there for one semester in 2021.
Kristin Schwiermann, a neighbour of his family’s, described him as “smart” and “quiet”, and added that he “never caused any problems”.
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0:42
Woman recalls encounter with Charlie Kirk suspect
Memorial to be held at Super Bowl venue
It was revealed on Sunday that a memorial to Kirkwill be held at the stadium where the 2023 US Super Bowl was held.
State Farm Stadium, just outside of Phoenix, Arizona, is home to the American football team the Arizona Cardinals and can hold 60,000 people.
President Donald Trump has said he plans to attend and will posthumously award Kirk with the highest US civilian honour – the Presidential Medal of Freedom.
Kirk, who hosted his own self-titled podcast, had millions of followers on social media.
He was a regular visitor at the White House and has been credited with the increase in young men voting for Mr Trump at the 2024 presidential election.
Experts have described engravings left on ammunition at the scene of the Charlie Kirk shooting as “extremely online” – so what do the words and symbols actually mean?
Authorities said on Friday that the suspect accused of fatally shooting the Conservative activist left behind bullet casings featuring references to fascism, video games and internet memes.
Image: Kirk at Utah Valley University where he was shot. Pic: Reuters/The Salt Lake Tribune
To those who aren’t chronically online, the messages may appear to be total gibberish. But for others, specifically gamers, many of the meanings will have immediately been clear.
Here’s what each of the casings reference – and why experts have cautioned against using them to make assumptions about the suspect’s political leanings.
1. ‘notices, bulges, OWO, what’s this?’
This writing appears to reference a meme about the furry subculture, which centres on an interest in anthropomorphic animal characters.
Within the furry community, OwO is an emoticon of a cute face (with the Os as the eyes and the w as a cute mouth or nose) and used as a way of flirting – but outside the community, it is often used in a mocking way, or as part of trolling.
It’s incredibly common for phrases used by people who are “extremely online” – which essentially means highly engaged in online culture – to have double or multiple meanings.
For this reason, experts have cautioned against trying to interpret messages such as these engravings to determine an attacker’s political leanings or motive.
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1:23
What we know about the shooting arrest
Jamie Cohen, an assistant professor of media studies who studies memes at Queens College in New York, said: “Oftentimes this extremely online disguise is meant to be doublespeak.”
Speaking to Sky News’ US partner NBC News, he continued: “It’s meant specifically for someone like me to dive into what they would call meme culture and declare them something so that they get more press.
“So it could just be another bait and switch for researchers who are falling into the same trap that they are designing for more viral exposure.”
2. ‘Hey, fascist! Catch ↑ → ↓↓↓’
When asked by Sky News’ US correspondent James Matthews what the messages on the casings meant, Utah governor Spencer Cox said the writing referring to a fascist “speaks for itself”.
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Engraving on bullet casing ‘speaks for itself’
The second half of the inscription – the directional arrows – were immediately identified by some gamers.
Helldivers 2 players have pointed out that the arrow sequence is the code used to summon a 500kg bomb in the 2024 game – which itself has been interpreted as a satire of fascism.
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Bella Ciao is a classic Italian song that became a popular anti-fascism anthem during Benito Mussolini’s dictatorship.
It has won renewed popularity in recent years thanks, in part, to featuring multiple times in Netflix’s Spanish television series Money Heist.
A popular remix of Bella Ciao has hit more than 260 million streams on Spotify worldwide and it’s become a favourite on TikTok, as well as within the gaming community.
This juvenile insult, using the well-known abbreviation for ‘laughing my ass off’, is a common ‘gotcha’ phrase and simply appears to mock investigators.
The messages, another expert has said, make one thing clear – the suspect was likely seeking fame.
Lindsay Hahn, a University at Buffalo associate professor who researches ideological extremism and the ways in which perpetrators of violence justify their actions, said the messages do not necessarily indicate a specific ideology.
“But what they do indicate, is that the shooter wanted to get a message across and therefore be talked about online,” she told NBC.
“It sort of seems like these messages, at the very minimum, were selected because he knew they were going to be talked about.”
A memorial for right-wing US influencer Charlie Kirk will be held next Sunday, in a stadium that previously hosted the 2023 Super Bowl.
The 31-year-old, who was a close ally of Donald Trump, was fatally shot in the neck on Wednesday while speaking to university students at an event in Utah.
His appearance at Utah Valley University was part of a planned tour of US college campuses.
Image: A memorial for Charlie Kirk at Turning Point USA headquarters in Phoenix, Arizona. Pic: Reuters
Image: Charlie Kirk at Utah Valley University, shortly before he was shot. Pic: AP
Turning Point USA, the prominent youth conservative organisation of which Mr Kirk was the president and co-founder, is holding the event at State Farm Stadium outside Phoenix.
The venue is the home of the NFL’s Arizona Cardinals and can hold more than 60,000 people.
Tyler Robinson, a 22-year-old from Washington, Utah, is being held without bail after being arrested on suspicion of aggravated murder, felony discharge of a firearm causing serious bodily harm and obstruction of justice charges, according to court documents.
The motivation behind the fatal shooting is still unclear, but Utah governor Spencer Cox commented that Robinson described Mr Kirk as “full of hate and spreading hate”.
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Robinson is due to make an initial court appearance on Tuesday, when he is also expected to be charged, the Utah County attorney’s office said.
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1:40
Suspect’s movements before and after shooting
President Trump, who will be back in the US after his UK state visit next week, has previously said he plans to attend Mr Kirk’s funeral.
Mr Trump has said he will be posthumously awarding Mr Kirk with the nation’s highest civilian honour, the Presidential Medal of Freedom.
Mr Kirk’s body was flown back from Salt Lake City to his home state of Arizona on Air Force Two on Thursday, with the US vice president and close friend JD Vance on board.
Image: JD Vance helps carry the coffin of Charlie Kirk from Air Force Two in Arizona
His widow, Erika Kirk, has vowed to continue his campus tour and his radio and podcast shows.
Speaking publicly for the first time in a livestreamed video on Friday, she said: “To everyone listening tonight across America, the movement my husband built will not die.”
“It won’t. I refuse to let that happen.”
She said she told her three-year-old daughter: “Daddy went on a work trip with Jesus.”
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1:12
Charlie Kirk shooting: What bullet inscriptions mean
A makeshift memorial to Mr Kirk has been set up at Utah Valley University, with flowers, American flags and handwritten messages left at the main entrance.
The university says there will be increased security when classes resume on Wednesday.