A person of interest has been taken into custody for the Midtown Manhattan murder of UnitedHealthcare CEO Brian Thompson outside the Hilton Hotel following a five-day manhunt, police said Monday.

The man was nabbed in Altoona, Penn., carrying a gun that appears to match the murder weapon seen in security video of the shooting, police sources said. A tip from a civilian who spotted the man lead cops to take him into custody, sources said.

The man taken into custody carrying a fake New Jersey ID, police sources said. No charges were immediately filed.

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Police were offering a $10,000 reward for any information leading to the gunman’s capture as the search for the masked shooter continued. The FBI also offered $50,000 for information resulting in an arrest and conviction of the suspect.

Harrowing surveillance footage shows the suspect creeping up and shooting Thompson in the back on W. 54th St. near Sixth Ave. about 6:45 a.m. Wednesday.

The 50-year-old CEO of the Minnesota-based company was approaching the Hilton to help prepare for an investor day conference, officials said.

Police released new images of the suspected shooter in the slaying of UnitedHeathcare CEO Brian Thompson. (NYPD)

After shooting Thompson in the back, the gunman then coolly clears a jam in his pistol before firing at least three more times, the video shows.

He fled the scene on a bicycle and disappeared in Central Park but cops picked up his trail late Wednesday night on the Upper West Side.

Cops found the words “Deny,” “Delay,” and “Depose” written on the bullets — a supposed insurance industry mantra for delaying claims and maximizing profits — leading police to believe that the killer has a beef with the insurance industry.

NYPD officers are pictured in the Ziegfeld Alley as they investigate the shooting death of United Healthcare CEO Brian Thompson, 50, outside the Hilton Club Residences at 1335 Sixth Ave. Wednesday. (Barry Williams / New York Daily News)

The gunman arrived in New York City on a Greyhound bus from Atlanta more than a week before unraveling his murder plot — and allowed images of his face to go public when he let his guard down flirting with a hostel worker.

NYPD detectives, with the help of Port Authority police, have managed to track the gunman’s movements from when he first arrived in the city. Police sources said the suspect arrived in the city on a Greyhound bus from Atlanta on the evening of Nov. 24.

He found his way to the HI New York City Hostel on Amsterdam Ave. near W. 104th St., where cops recovered images of the suspect without a mask and smiling at someone behind the reception desk.

The hostel staffer reportedly got the suspect to smile by flirting with him and asking him to pull down his mask to “see his handsome face.”