A person of interest was nabbed Monday in the fatal shooting of UnitedHealthcare CEO Brian Thompson — busted possibly trying to use a fake ID in a McDonald’s, law enforcement sources said.

The man — who sources said is being eyed for the coldblooded, targeted execution in front of a Manhattan hotel last week — allegedly had a manifesto on him when he was taken into custody by cops in Altoona, Pa.

He also had a gun, silencer, four fake IDs and other items “consistent” with what authorities were looking for in the case, sources said.

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Law enforcement was still trying to figure out the man’s real identity, sources said.

He was nabbed on a tip called in to local cops, who apprehended him, sources said.

The NYPD was on its way to Altoona late Monday morning, sources said.

The bust came amid a massive manhunt for the masked shooter who lay in wait outside the Hilton on Sixth Avenue where Thompson, 50, was set to speak at an investors’ conference Wednesday morning.

The chillingly efficient gunman snuck up behind Thompson on the sidewalk, pulled out what appeared to be a handgun with a silencer and calmly unloaded multiple shots at the CEO’s back, shocking surveillance footage showed.

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Thompson dropped to the ground after he was hit in the back and right calf, with the gunman quickly running off before grabbing an e-bike and riding away.

Thompson was rushed to Mount Sinai hospital, where he was pronounced dead.

The execution prompted a massive manhunt and a steady drip of sometimes bizarre clues and revelations.

What we know about the shooting of UnitedHealthcare CEO Brian Thompson

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• Brian Thompson, the CEO of insurance giant UnitedHealthcare, was gunned down Wednesday outside a luxury Midtown hotel in a “brazen, targeted attack,” police said.
• The methodical killer used a firearm with a silencer outside the Hilton hotel along Sixth Avenue.
• The gunman fired at Thompson multiple times, striking his back and right calf before fleeing on foot.
• The NYPD released a new photo of the hooded suspect standing in front of the counter at the Starbucks at West 56th Street and 6th Avenue, just minutes from the Hilton hotel where he gunned down Thompson, 50.
• Thompson was named CEO of UnitedHealth in April 2021. He joined the company in 2004. He was one of several senior executives at the company under investigation by the Department of Justice.
• Thompson’s wife, Paulette, said her husband had been getting threats before he was killed.
• The NYPD is investigating a possible message — which appears to include the words “deny,” “depose” and “defend” — written on live rounds and shell casings left behind by the masked assassin.
• A person of interest has been nabbed by police officers inside a McDonald’s in Altoona, Pa.

Follow along with The Post’s live updates on the news surrounding Brian Thompson’s murder.

The shooter’s bullets found at the scene appeared to have the words “deny,” “depose” and “defend” written on them — a potential message from the killer that echoed the title of a book condemning the health care insurance industry’s practice of not paying claims.

Video uncovered during the investigation also revealed the suspected killer’s smiling face, as well as his potential connection to an Upper West Side hostel, where he is believed to have stayed before the murder.

A motive wasn’t immediately known.

NYPD Commissioner Jessica Tisch has told reporters that the shooter intentionally targeted Thompson — a father of two sons, whose wife said had been the target of recent threats over his job — as witnesses milled around the hotel.

“Many people passed the suspect, but he appeared to wait for his intended target,” she said.

It is not immediately clear if anyone has claimed the $10,000 reward offered by the NYPD and CrimeStoppers.

Thompson’s wife, Paulette “Pauley” Thompson, 51, said that before the shooting, the family had received threats relating to her husband’s job leading America’s largest private insurer, NBC News reports.

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“There had been some threats,” she said, according to NBC. “Basically, I don’t know, a lack of coverage? I don’t know details. I just know that he said there were some people that had been threatening him.”

Law enforcement sources confirmed to The Post that UnitedHealthcare had told investigators about threats made against Thompson.

Thompson was promoted in 2021 to CEO of UnitedHealthcare, where he earned nearly $10 million the next year, according to the Economic Research Institute.

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The shooting sent the investors’ conference, which Thompson was due to speak, into a panic, with witnesses saying the attendees left in shock and tears.

The UnitedHealth Group released a statement expressing shock at Thompson’s death.

“Brian was a highly respected colleague and friend to all who worked with him,” the statement reads.

Flags at the company’s corporate headquarters in Minnetonka, Minn., were flown at half-staff on Wednesday.

“This is horrifying news and a terrible loss for the business and health care community in Minnesota.” Gov. Tim Walz said in a statement. “Minnesota is sending our prayers to Brian’s family and the UnitedHealthcare team.”