A University of Pennsylvania graduate is in custody following the targeted attack of Brian Thompson, the CEO of major insurance group UnitedHealthcare who was fatally shot outside a Midtown Manhattan hotel ahead of an investor conference, police said Monday.

Luigi Mangione is a suspect in the fatal shooting, authorities confirmed Monday night during a press briefing in Altoona, Pennsylvania, where he was apprehended after an individual at a McDonald’s recognized him from the wildly circulated images of the suspect sought in the shooting.

Mangione, 26, was initially identified as a “strong” person of interest in the shooting death after he was apprehended at the McDonald’s, New York City Mayor Eric Adams said during a press briefing in New York on Monday.

Charges could be filed against Mangione in the homicide as early as Monday or Tuesday, authorities said. Investigators are working to determine whether anyone else was involved in Thompson’s death.

Mangione was eating at the McDonald’s Monday morning when an individual thought he looked suspiciously like the shooting suspect and alerted an employee, who called police, authorities said.

He was carrying a firearm and suppressor “both consistent with the weapon used in the murder,” NYPD Commissioner Jessica Tisch said during the press briefing earlier Monday. The gun “may have been made on a 3D printer,” police said.

He also had “multiple fraudulent IDs,” including a fake New Jersey ID matching the ID the suspect used to check into his New York City hostel before the shooting incident, Tisch said. He was carrying a U.S. passport that identified him as Luigi Mangione, police said.

Police also recovered clothing, including a mask consistent with those worn by the wanted individual, as well as a three-page “handwritten document that speaks to both his motivation and mindset,” she said.

Mangione was arrested on unrelated charges Monday, police said. He was in possession of a ghost gun capable of firing a 9mm round and will face gun charges in Altoona, NYPD Chief of Detectives Joseph Kenny told reporters during the briefing earlier Monday.

He has been charged in Pennsylvania with five crimes, including carrying a gun without a license, forgery, falsely identifying himself to authorities and possessing “instruments of crime,” according to a newly released criminal complaint.

The charging document alleges that Mangione lied about his identity to police and carried the ghost gun without a license.

When Altoona police asked him if he had ever been to New York City, Mangione started shaking, according to the charging document. He didn’t answer the question directly, police said.

Police said they are working to develop a full sense of his timeline in Pennsylvania and how long he has been in Altoona.

The NYPD sent detectives to Altoona to interview him and are going through the recovered writings and his social media, police said.

“It does seem that he had some ill will toward corporate America,” Kenny said.

A Goodreads account that appears to belong to Mangione left a four-star review on Ted Kaczynski’s “Industrial Society and Its Future” — more commonly known as the “Unabomber manifesto” — and described Kaczynski as “a violent individual — rightfully imprisoned — who maimed innocent people. While these actions tend to be characterized as those of a crazy Luddite, however, they are more accurately seen as those of an extreme political revolutionary.”

A source confirmed to ABC News that the Goodreads account is part of the law enforcement investigation.

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