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.
But there are fears they will discuss a deal robbing Ukraine of the land currently occupied by Russia – something Volodymyr Zelenskyy has said he won’t accept.
Here’s what three of our correspondents think ahead of the much-anticipated face-to-face.
Putin’s legacy is at stake – he’ll want territory and more By Ivor Bennett, Moscow correspondent, in Alaska
Putin doesn’t just want victory. He needs it.
Three and a half years after he ordered the invasion of Ukraine, this war has to end in a visible win for the Russian president. It can’t have been for nothing. His legacy is at stake.
So the only deal I think he’ll be willing to accept at Friday’s summit is one that secures Moscow’s goals.
These include territory (full control of the four Ukrainian regions which Russia has already claimed), permanent neutrality for Kyiv and limits on its armed forces.
I expect he’ll be trying to convince Trump that such a deal is the quickest path to peace. The only alternative, in Russia’s eyes, is an outright triumph on the battlefield.
Image: Vladimir Putin and Donald Trump meeting in Osaka in 2019
I think Putin‘s hope is that the American president agrees with this view and then gives Ukraine a choice: accept our terms or go it alone without US support.
A deal like that might not be possible this week, but it may be in the future if Putin can give Trump something in return.
That’s why there’s been lots of talk from Moscow this week about all the lucrative business deals that can come from better US-Russia relations.
The Kremlin will want to use this opportunity to remind the White House of what else it can offer, apart from an end to the fighting.
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4:25
What will Kyiv be asked to give up?
Ukraine would rather this summit not be happening By Dominic Waghorn, international affairs editor, in Ukraine
Ukraine would far rather this meeting wasn’t happening.
Trump seemed to have lost patience with Putin and was about to hit Russia with more severe sanctions until he was distracted by the Russian leader’s suggestion that they meet.
Ukrainians say the Alaska summit rewards Putin by putting him back on the world stage.
But the meeting is happening, and they have to be realistic.
Most of all, they want a ceasefire before any negotiations can happen. Then they want the promise of security guarantees.
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2:35
Does Europe have any power over Ukraine’s future?
That is because they know that Putin may well come back for more even if peace does break out. They need to be able to defend themselves should that happen.
And they want the promise of reparations to rebuild their country, devastated by Putin’s wanton, unprovoked act of aggression.
There are billions of Russian roubles and assets frozen across the West. They want them released and sent their way.
What they fear is Trump being hoodwinked by Putin with the lure of profit from US-Russian relations being restored, regardless of Ukraine’s fate.
Image: US Army paratroopers train at the military base where discussions will take place. File pic: Reuters
That would allow Russia to regain its strength, rearm and prepare for another round of fighting in a few years’ time.
Trump and his golf buddy-turned-negotiator Steve Witkoff appear to believe Putin might be satisfied with keeping some of the land he has taken by force.
Putin says he wants much more than that. He wants Ukraine to cease to exist as a country separate from Russia.
Any agreement short of that is only likely to be temporary.
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1:41
Zelenskyy: I told Trump ‘Putin is bluffing’
Trump’s pride on the line – he has a reputation to restore By Martha Kelner, US correspondent, in Alaska
As with anything Donald Trump does, he already has a picture in his mind.
The image of Trump shaking hands with the ultimate strongman leader, Vladimir Putin, on US soil calls to his vanity and love of an attention-grabbing moment.
There is also pride at stake.
Image: Joint Base Elmendorf-Richardson in Alaska, where Trump will meet his Russian counterpart. File pic: Reuters
Trump campaigned saying he would end the Russia-Ukraine war on his first day in office, so there is an element of him wanting to follow through on that promise to voters, even though it’s taken him 200-plus days in office and all he’s got so far is this meeting, without apparently any concessions on Putin’s end.
In Trump’s mind – and in the minds of many of his supporters – he is the master negotiator, the chief dealmaker, and he wants to bolster that reputation.
He is keen to further the notion that he negotiates in a different, more straightforward way than his predecessors and that it is paying dividends.
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Photos of rabbits in Colorado with black, horn-like growths around their faces have gone viral, with some describing the animals as “Frankenstein-“, “zombie-” and “demon-rabbits”.
Warning: This article contains images of infected rabbits, which some readers may find disturbing.
Residents in Fort Collins near Denver recently began posting pictures of the cottontail bunnies, causing a stir online.
“This is how the zombie virus starts,” posted one Instagram user on a post showing the rabbits.
“We’ve got freaking zombie rabbits now?!” posted another on YouTube.
So what’s going on?
Firstly, the pictures are real – despite some wishing they weren’t.
“One time I need this to be AI,” wrote one Instagram user on a post showing the horned bunnies.
The rabbits are suffering from a relatively harmless disease called Shope Papilloma Virus, according to Colorado Parks and Wildlife.
Image: A rabbit infected with Shope Papilloma Virus. Pic: Iowa Department of Natural Resources
Although the wildlife agency is getting calls from people spotting the infected rabbits in Fort Collins, they’re not an unusual sight, according to spokesperson Kara Van Hoose.
The disease is mainly found in America’s Midwest, according to the University of Missouri, and is more noticeable in the summer, when the fleas and ticks that spread the virus are most active.
The virus can also spread through rabbit-to-rabbit contact but not to other species like humans or dogs and cats, according to Ms Van Hoose.
People are being warned not to touch the infected rabbits, however.
The horn-like growths, or papillomas, are harmless to the bunnies, unless they grow on sensitive areas like the eyes or mouth or interfere with eating.
Once the rabbits’ immune systems have fought the virus, the growths will disappear.
Although infected wild rabbits usually don’t need treatment, it can be dangerous to pet rabbits, so officials recommend getting pet bunnies treated by a vet.
Image: The myth of the jackalope may have been inspired by rabbits with Shope Papilloma Virus. File pic: iStock
The mythical jackalope
It’s not a new illness, and is even thought to have inspired the centuries-old myth of the “jackalope”, a rabbit with antelope antlers.
Although hunters had long known about the disease, it was first scientifically reported in 1931 by Richard E Shope – hence the name.
Since then, the rabbits’ warts and horns have contributed to life-saving scientific understanding, including how viruses can be linked to cancer, like the HPV virus to cervical cancer.