A chilling handwritten ‘manifesto’ was reportedly found on suspected Brian Thompson shooter Luigi Mangione when he was arrested.

The Ivy League graduate, 26, from Maryland, who has been charged with the murder of the UnitedHealthcare CEO, was taken into custody on Monday (9 December).

A McDonald’s employee identified Mangione at the Pennsylvania eatery after police found him with items linking him to the murder, such as a gun, mask, and writings.

Luigi Mangione has been charged with the murder of UnitedHealthcare CEO Brian Thompson (PA Department of Corrections)

He is currently being held without bail in Pennsylvania and is likely be transferred to a Pennsylvania state correctional facility this evening, Gov. Josh Shapiro said.

Alongside the murder charge, Mangione has been charged with possession of an unlicensed firearm, forgery, and providing false identification to police.

Thompson, 50, who took the UnitedHealthcare CEO role in 2021, was shot dead outside the Hilton Hotel on Sixth Avenue in Midtown Manhattan last Wednesday.

At around 6:46 am local time, the father-of-two was shot at least once in the back and once in the calf before he was taken to hospital and pronounced dead.

Suspected Brian Thompson shooter Luigi Mangione has been detained (Altoona Police Department via Getty Images)

Before Mangione was located, police found what is believed to be his bag there on Friday, which included a stack of Monopoly money, sparking a major theory.

Now, in the suspect’s bag found with him at the Pennsylvania McDonald’s, there was reportedly a 262-word handwritten note.

A senior law enforcement official who reportedly saw the document told The New York Times that the note appeared to show Mangione open up about the shooting.

“To save you a lengthy investigation, I state plainly that I wasn’t working with anyone,” the suspect reportedly wrote, adding companies that ‘continue to abuse our country for immense profit because the American public has allowed them to get away with it’.

He also reportedly wrote that ‘these parasites had it coming’ and ‘I do apologise for any strife and trauma, but it had to be done’.

The New York City Police Department (NYPD) Commissioner Jessica Tisch thanked the McDonald’s employee who got in touch with the force after noticing a man who looked like the suspect.

“The suspect was in a McDonald’s and was recognized by an employee who then called local police,” she said.

“Responding officers questioned the suspect, who was acting suspiciously and was carrying multiple fraudulent IDs, as well as a U.S. passport.

“Upon further investigation, officers recovered a firearm on his person, as well as a suppressor, both consistent with the weapon used in the murder.