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.
13 people have been killed in the US state of Texas after heavy rain caused flash flooding, according to local media reports.
Officials have also said more than 20 are missing from a girls’ camp in Texas.
As much as 10 inches (25 centimetres) of heavy rain fell in just a few hours overnight in central Kerr County, causing flash flooding of the Guadalupe River.
Judge Rob Kelly, the chief elected official in the county, confirmed fatalities from the flooding and dozens of water rescues so far.
A flood watch issued on Thursday afternoon estimated isolated amounts up to seven inches (17 centimetres) of rising water.
This breaking news story is being updated and more details will be published shortly.
Vladimir Putin told Donald Trump he “will not back down” from Russia’s goals in Ukraine during a phone call today, the Kremlin has said.
The Russian president spoke to his US counterpart for almost an hour, and Mr Trump “again raised the issue of an early end to military action” in Ukraine, Kremlin aide Yuri Ushakov told reporters.
In response, Mr Putin said “Russia will not back down” from its aims there, which include “the elimination of the well-known root causes that led to the current state of affairs,” Mr Ushakov said.
The phrase “root causes” is shorthand for Moscow’s argument that it was compelled to invade Ukraine in order to prevent the country from joining NATO.
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Trump and Putin’s latest call on Ukraine
Ukraine and its European allies say this is a pretext to justify what they call an imperial-style war, but Mr Trump has previously shown sympathy with Russia.
At the same time, Mr Putin told the US president that Russia is ready to continue negotiating, the aide said.
The Russian president said any prospective peace deal must see Ukraine give up its NATO bid and recognise his country’s territorial gains.
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Image: Volodymyr Zelenskyy, seen with Mr Trump in June, is pushing for Ukraine to join NATO. Pic: Reuters
He also briefed Mr Trump on agreements made last month, which saw Russia and Ukraine exchange prisoners of war and dead soldiers.
Specific dates for the third round of peace talks in Istanbul were not discussed – nor was the US decision to halt some shipments of critical weapons to Ukraine.
Mr Putin and Mr Trump’s call came after the Pentagon confirmed some weapons due to be sent to Ukraine have been held as it reviews military stockpiles.
The paused shipments include air defence missiles and precision-guided artillery, two people familiar with the situation have said.
Donald Trump’s ‘big beautiful bill’ has been passed by the US congress, sending it to the president to sign into law.
The controversial tax breaks and spending cuts package cleared its final hurdle as the Republican-controlled House of Representatives narrowly approved the bill with a 218-214 vote.
The bill delivers tax breaks Mr Trump promised in his 2024 election campaign, cuts health and food safety programmes, and zeroes out dozens of green energy incentives.
According to the nonpartisan Congressional Budget Office (CBO), it will lower tax revenues by $4.5trn over 10 years and add $3.4trn to the US’s $36.2trn debt.
But despite concerns over the 869-page bill’s price tag – and its hit to healthcare programmes – Republicans largely lined up in support, with just two rebelling on the vote.
Image: House Speaker Mike Johnson is congratulated following the vote. Pic: Reuters
Every Democrat in Congress voted against the bill, blasting it as a giveaway to the wealthy that will leave millions of Americans uninsured.
House Speaker Mike Johnson made the Republicans’ closing argument for the bill, telling Congress: “For everyday Americans, this means real, positive change that they can feel.”
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Earlier, the House’s Democratic leader Hakeem Jeffries gave a record-breaking eight-hour and 44-minute speech against it.
“The focus of this bill, the justification for all of the cuts that will hurt everyday Americans, is to provide massive tax breaks for billionaires,” he said.
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The bill’s spending cuts largely target Medicaid, the health programme that covers 71 million Americans on low incomes.
It will tighten enrolment standards, institute a work requirement and clamp down on a funding mechanism used by states to boost federal payments.
The changes could leave nearly 12 million people without health insurance, according to the CBO.
On the other side of the ledger, it will stave off tax increases that were due to hit most Americans at the end of the year, when tax cuts from President Trump’s first term were due to expire.
It also sets up new tax breaks for overtime pay, seniors and tipped income.