Police are questioning a man in Altoona, Pennsylvania, in connection with the fatal shooting of UnitedHealthcare CEO Brian Thompson last week in Manhattan.

NYPD officials on Monday identified the man as 26-year-old Luigi Mangione. He is under arrest on gun charges, police said.

Here’s what else we learned:

How he was found: The suspect was “sitting there eating” at a McDonald’s in Altoona, Pennsylvania, when an employee of the restaurant recognized him and called police, NYPD Chief of Detectives Joseph Kenny said. He credited the tip to the wide circulation of a photo the NYPD released last week of the person without a mask on.

Remember: The suspect was believed to have left New York City on an interstate bus, police officials said last week, after video cameras captured him entering the George Washington Bridge Bus Station on 178th Street but not exiting it.

More evidence: When he was searched by local police, the suspect was found carrying multiple fraudulent IDs, a US passport, a firearm and suppressor “consistent with the weapon used in the murder,” New York City Police Commissioner Jessica Tisch said. Kenny said the gun was a ghost gun “that had the capability of firing a 9mm round,” and it may have been 3D printed. Police also said one of the IDs was a fraudulent New Jersey ID matching the one the suspect used to check into a New York City hostel before the shooting.

Recovered documents: A multi-page, handwritten document was also recovered from the suspect when he was arrested, according to Kenny. It seemed that the man “has some ill will towards corporate America,” Kenny said. In the document, the suspect rails against the health care industry and suggested that violence is the answer, a police official who has seen the document told CNN. Two quotes in the document include: “These parasites had it coming” and “I do apologize for any strife and trauma, but it had to be done,” an official said.

Other key details: Police believe the suspect acted alone and they don’t think he was trying to flee the country, Kenny said.

What we know about the suspect: The man has had no prior arrests in New York, according to Kenny. He is 26 years old and was born in Maryland. His last known address was in Honolulu, Hawaii, Kenny said.

How the investigation unfolded: Investigators deployed drones, K-9 units and even scuba divers during the search, Tisch said. In addition to combing through hours of video — which led to the photo of the suspect without a mask on — detectives also went door-to-door, she said, adding that tips led to the recovery of crucial evidence.

What happens now: NYPD detectives are on their way to Pennsylvania, where they hope to interview the suspect further, Tisch said. The suspect would need to be extradited to New York to face any charges there.

Catch up on other key developments:

A partial fingerprint and DNA recovered during the search have so far not yielded matches when compared against law enforcement databases, according to a law enforcement official. The fingerprint was recovered from a purported “burner phone” thought to belong to the suspect, and the DNA from a water bottle and energy bar wrapper the suspect is said to have bought.

Police released more photos of the suspect over the weekend: in the backseat of a taxi and wearing a jacket while walking on the street. In both, he’s wearing a hood and a face mask.

A backpack believed to be the suspect’s was recovered Friday in Central Park, a law enforcement source said. It contained money from the Monopoly board game, a law enforcement source told CNN, and a Tommy Hilfiger jacket, officials briefed on the matter said.