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.
Donald Trump has responded after Elon Musk said some of his recent social media posts about the US president “went too far”.
The Tesla and SpaceX boss shared a series of posts on his X social media platform last week, including one which described Mr Trump’s sweeping tax and spending bill as a “disgusting abomination”.
Posting on X this morning, Mr Musk said: “I regret some of my posts about President @realDonaldTrump last week. They went too far.”
In response, the president is quoted as telling the New York Post: “I thought it was very nice that he did that.”
The publication said it spoke to Mr Trump in a brief phone conversation.
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19:32
Musk and Trump’s bust-up
The White House dismissed Mr Musk’s Epstein claims at the time, with press secretary Karoline Leavitt saying: “This is an unfortunate episode from Elon, who is unhappy with the One Big Beautiful Bill [a Republican tax and spending bill] because it does not include the policies he wanted.
“The president is focused on passing this historic piece of legislation and making our country great again.”
Mr Musk did not specify which posts he regretted.
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1:58
Could the Musk-Trump fallout stall US space goals?
In another post last Thursday, Mr Musk attacked Mr Trump’s tariffs, saying they “will cause a recession in the second half of this year”.
In response, Mr Trump, in an interview with ABC News, said Mr Musk had “lost his mind”. He also threatened to cancel government contracts with the businessman’s companies and said he had asked the billionaire to leave the White House.
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4:02
Trump and Musk’s feud explained
But yesterday, Mr Musk’s father Errol Musk told Sky News’ Moscow correspondent Ivor Bennett: “It’s like any argument. Everybody at some point says I’ll never make up, but then they do later.”
He said the argument likely happened because of “emotions welling out of hand”.
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0:46
Elon’s dad on the Musk-Trump bust-up
“They’ve had five months of intense day and night, hardly any sleep, and anybody who went through that would know your nerves are pretty much shredded after that time.”
He also said his son had texted him to say: “Don’t worry, we’re sorting it out.”
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A curfew has come into force in Los Angeles as officials attempt to “stop the vandalism and stop the looting”.
Mayor Karen Bass said the restrictions will be in force in downtown areas of the city from 8pm to 6am local time (4am to 2pm UK time) – and will likely be repeated in the coming days.
She confirmed that a local emergency had been declared as “we reached a tipping point”, with 23 businesses looted on Monday night.
Ms Bass said “graffiti is everywhere”, with “significant damage” to properties as a result of the protests.
Image: Workers try to remove graffiti after a protest over immigration raids. ICE Pic: AP/Damian Dovarganes
Image: Workers remove graffiti from the Ronald Reagan Federal Building in Santa Ana. Pic: Mindy Schauer/The Orange County Register via AP
Image: A protester marches past businesses being boarded up. Pic: Reuters/Leah Millis
Jim McDonnell, the chief of the Los Angeles Police Department, described the curfew as a “necessary measure to protect lives” as “unlawful and dangerous behaviour” had been escalating in the last few days.
On Tuesday alone, 197 arrests were made by the force, and he warned anyone violating the curfew without a valid reason would be detained.
Residents, people who are homeless, those travelling to and from work, credited media as well as public safety and emergency personnel, will be exempt from the curfew.
More on Los Angeles
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The curfew covers a one square mile section of downtown LA that includes the area where protests have happened since Friday. The city of Los Angeles encompasses about 500 square miles.
Image: Workers board up a store in Santa Ana. Pic: AP/Jae C. Hong
Image: California National Guard soldiers stand at a federal agency building. Pic: AP
Image: Protesters are detained by law enforcement near the federal building in downtown LA. Pic: AP/Eric Thayer
The protests are in response to raids carried out by the US Immigration and Customs Enforcement agency (ICE).
US President Donald Trump has activated 4,000 National Guard troops – the federal reserve force – to protect ICE officers carrying out raids as well as federal buildings in LA, despite objections by California Governor Gavin Newsom, who called the deployments unnecessary, illegal and politically motivated.
Mr Trump also sent 700 marines, who are expected to start operating in the LA area on Wednesday, according to the US Northern Command.
Image: The Ronald Reagan Federal Building and Courthouse in Santa are boarded up. Pic: Mindy Schauer/The Orange County Register via AP
Image: National Guard troops are lined up to protect a federal building in downtown LA. Pic: AP/Eric Thayer
State officials said Mr Trump’s response was an extreme overreaction to mostly peaceful demonstrations, with California senators Adam Schiff and Alex Padilla saying the domestic mobilisation of active-duty military personnel should only happen “during the most extreme circumstances, and these are not them”.
Mr Trump defended his decision in a speech to soldiers at the Army base in Fort Bragg, North Carolina, saying his administration would “liberate Los Angeles”.
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0:49
Trump: ‘We will liberate Los Angeles’
“Generations of Army heroes did not shed their blood on distant shores only to watch our country be destroyed by invasion and third-world lawlessness,” Mr Trump said.
“What you’re witnessing in California is a full-blown assault on peace, on public order and on national sovereignty, carried out by rioters bearing foreign flags.”
Image: A protester is arrested by law enforcement officers in downtown LA. Pic: AP/Eric Thayer
Image: California Highway Patrol officers clash with protesters in LA. Pic: AP/Eric Thayer
Gavin Newsom launched a blistering response in an address on Tuesday evening, saying the deployment of the National Guard without consulting Californian officials was a “brazen abuse of power by a sitting president”.
He said it “enflamed a combustible situation, putting our people, our officers and even our National Guard at risk”.
“That’s when the downward spiral began. He doubled down on his dangerous National Guard deployment by fanning the flames even harder – and the president, he did it on purpose,” Mr Newsom said.
Newsom takes the fight to Trump
California Governor Gavin Newsom’s televised address to the nation felt presidential as he took the fight to the man in the Oval Office, with a series of scorching putdowns.
He made a compelling case that Donald Trump’s extraordinary decision to send troops to LA against his wishes had put the country on the brink of authoritarianism.
He spoke the day after the Pentagon announced 700 marines were being deployed to join 4,000 National Guard troops ordered to the streets of LA by Trump.
But there has been no evidence so far that local law enforcement is being overwhelmed by the size or might of this resistance movement.
The head-to-head between Trump and Newsom is a compelling one.
The governor is known to harbour presidential ambitions for 2028 and is something of a MAGA bogeyman.
Newsom presides over a blue state, the biggest in the country, and is growing his brand with a podcast and – now – Trump has effectively put him in the national spotlight by bringing this political battle to his door.
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The governor accused Mr Trump of choosing escalation and “theatrics over public safety”, as the situation was “winding down” before the president deployed the troops.
Mr Newsom added: “When Donald Trump sought blanket authority to commandeer the National Guard, he made that order apply to every state in this nation.
“This is about all of us, this is about you. California may be first, but it clearly won’t end here; other states are next. Democracy is next. Democracy is under assault before our eyes.”
Image: A man holds a Mexican flag, which has become synonymous with solidarity for migrants targeted in the raids. Pic: AP/Damian Dovarganes
Image: A protester holds up a placard while marching through downtown LA. Pic: Reuters/Leah Millis
Image: People protest against the ongoing immigration raids in Washington, D.C. Pic: AP/Julia Demaree Nikhinson
Homeland Security said on Monday that ICE had arrested 2,000 immigration offenders per day recently, which significantly exceeds the 311 daily average in the fiscal year 2024 under former president Joe Biden.
The protests over the immigration raids have started to spread across the US, with demonstrations in cities like Seattle, Austin, Chicago and Washington, DC.
While chaos in Los Angeles continues, with a curfew in place in the city to prevent further unrest, Donald Trump spent the day hunkered down in a bunker with helicopters soaring above and drones buzzing by at a celebration of the US army’s birthday.
US correspondents Mark Stone in Washington DC and Martha Kelner in LA discuss the parallels between the president’s display of military celebration, and sending troops in to restore law and order against protesters.
Plus, as US and Chinese negotiators meet in London to try and resolve the ongoing trade war between the two nations, Mark and Martha ask what’s at stake.
If you’ve got a question you’d like the Trump100 team to answer, you can email it to trump100@sky.uk.