Prosecutors in New York City charged accused UnitedHealthcare CEO killer Luigi Mangione with murder late Monday night, according to online court records.

The 26-year-old was also charged with criminal possession of a weapon (loaded firearm), possession of a forged instrument and criminal possession of a weapon (firearm silencer) in the brazen Dec. 4 shooting death of Brian Thompson.

Thompson, 50, was shot from behind on the sidewalk outside a NYC Hilton hotel before a shareholder conference. He was appointed the CEO of the company in April 2021.

Mangione was arrested in Altoona, Pennsylvania, on Monday after a five-day nationwide manhunt for Thompson’s killer.

UNITEDHEALTHCARE CEO MURDER SUSPECT ARRESTED AT PENNSYLVANIA MCDONALD’S

Rookie Altoona police officer Tyler Frye took Mangione into custody after an employee and a customer at a McDonald’s in the town thought he looked like the suspect on a wanted poster and called authorities.

When officers approached Mangione, who was wearing a mask and a beanie and working on a laptop in the back of the restaurant, and asked him to remove his face covering, they recognized him as the suspect wanted for questioning in Thompson’s murder.

During that encounter, he allegedly handed over a fake ID, gave a phony name, and “became quiet and started to shake” when asked if he’d recently been to New York.

He was also allegedly in possession of writings criticizing the healthcare industry and a ghost gun similar to the one believed to have been used to kill Thompson.

Altoona police initially took Mangione into custody on charges unrelated to Thompson’s murder – possession of an unlicensed firearm, providing false identification to police and forgery.

WHO IS LUIGI MANGIONE, SUSPECT IN UNITEDHEALTHCARE CEO MURDER? 

Mangione graduated top of his class from the elite Gilman School in Baltimore, and even delivered the commencement speech at his 2016 graduation, according to video of the ceremony.

“He seemed like a smart kid, he was always doing the right thing, it seemed like,” a former classmate, who was shocked by the arrest, told Fox News Digital Monday. “Wasn’t crazy.”

He then graduated from the University of Pennsylvania with a bachelor’s and master’s degree in engineering and was part of the Eta Kappa Nu Honor Society for Electrical and Computer Engineering.

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Mangione is expected to be extradited to New York as early as Tuesday.

Fox News Digital’s Michael Ruiz and Brooke Curto contributed to this report.