Mangione, 26, was arrested Monday, December 9,  at a McDonald’s in Altoona, Pennsylvania, following an intense five-day nationwide manhunt after 50-year-old Brian Thompson was sh0t from behind on the sidewalk outside a New York City Hilton hotel before a shareholder conference. 

He was charged with můrder hours after he was arrested in the killing of Brian Thompson, who led the United States’ largest medical insurance company.

Mangione remained jailed in Pennsylvania, where he was initially charged with possession of an unlicensed firearm, forgery, and providing false identification to police. Manhattan prosecutors have obtained an arrest warrant, a step that could help expedite his extradition from Pennsylvania.

Court officials have said that Mangione does not yet have an attorney who can comment on the allegations. Asked at Monday’s arraignment whether he needed a public defender, Mangione asked whether he could "answer that at a future date."

Mangione was arrested in Altoona, Pennsylvania about 230 miles (about 370 kilometers) west of New York City after a McDonald's customer recognized him and notified an employee, authorities said.

Officers found him sitting at a back table, wearing a blue medical mask and looking at a laptop, according to a Pennsylvania police criminal complaint.

He initially gave them a fake ID, but when an officer asked Mangione whether he’d been to New York recently, he "became quiet and started to shake," the complaint says.

When he pulled his mask down at officers' request, "we knew that was our guy," rookie Officer Tyler Frye said.

New York Police Commissioner Jessica Tisch said Mangione was carrying a gun like the one used to k!ll Thompson and the same fake ID the shooter had used to check into a New York hostel, along with a passport and other fraudulent IDs.

NYPD Chief of Detectives Joseph Kenny said Mangione also had a three-page, handwritten document that shows "some ill will toward corporate America."

Brian Thompson, 50, was k!lled last Wednesday as he walked alone to a Manhattan hotel for an investor conference.