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NYPD Chief of Detectives Joseph Kenny identified the suspect as Luigi Nicholas Mangione, who was born and raised in Maryland, has ties to San Francisco and a last known address in Honolulu, Hawaii.

Mangione had a ghost gun, a type of weapon that can be assembled at home from parts without a serial number, making them difficult to trace, investigators said. "As of right now the information we're getting from Altoona is that the gun appears to be a ghost gun that may have been made on a 3D printer, capable of firing a 9 mm round," Kenny said. Altoona, Pennsylvania, is about 233 miles west of New York City.

Officers questioned Mangione, who was acting suspiciously and carrying multiple fraudulent IDs, as well as a U.S. passport, Tisch said. Mangione was carrying a firearm and officers found a suppressor, "both consistent with the weapon used in the murder," the commissioner said. Police found a three-page document with writings suggesting that Mangione had "ill will toward corporate America," Kenny said. The handwritten document "speaks to both his motivation and mindset," Tisch said.

UnitedHealth CEO Brian Thompson, 50, was killed last Wednesday in what police said was a "brazen, targeted" attack as he walked alone to the Hilton from a nearby hotel, where UnitedHealthcare's parent company, UnitedHealth Group, was holding its annual investor conference, police said. The shooter appeared to be "lying in wait for several minutes" before approaching the executive from behind and opening fire, Tisch said. In the days since the shooting, police turned to the public for help by releasing a collection of photos and video 69制片厂制作传媒� including footage of the attack, as well as images of the suspect at a Starbucks beforehand. Photos taken in the lobby of a hostel on Manhattan's Upper West Side showed the suspect grinning after removing his mask, police said.

Investigators have suggested the gunman may have been a disgruntled employee or client of the insurer. Ammunition found near Thompson's body bore the words "delay," "deny" and "depose," mimicking a phrase used by insurance industry critics. The gunman concealed his identity with a mask during the shooting yet left a trail of evidence, including a backpack he ditched in Central Park, a cellphone found in a pedestrian plaza and a water bottle and protein bar wrapper that police say he bought at Starbucks minutes before the attack.

Monday's development came as dogs and divers returned to New York's Central Park while the dragnet for Thompson's killer stretched into a sixth day.

Investigators have been combing the park since the shooting and have been searching at least one of its ponds for three days. On Friday, police found the backpack that they say the killer discarded as he fled from the crime scene to an uptown bus station, where they believe he left the city on a bus. Retracing the gunman's steps using surveillance video, investigators say the shooter fled into Central Park on a bicycle, emerged from park without his backpack and then ditched the bicycle. He then walked a couple blocks and got into a taxi, arriving at at the George Washington Bridge Bus Station, which is near the northern tip of Manhattan and offers commuter service to New Jersey and Greyhound routes to Philadelphia, Boston and Washington, NYPD Chief of Detectives Joseph Kenny said. The FBI announced late Friday that it was offering a $50,000 reward for information leading to an arrest and conviction, adding to a reward of up to $10,000 that the NYPD has offered. Police say they believe the suspect acted alone.

Late Saturday, police released two additional photos of the suspect that appeared to be from a camera mounted inside a taxi. The first shows him outside the vehicle and the second shows him looking through the partition between the back seat and the front of the cab. In both, his face is partially obscured by a blue mask.