A New York City man says he was followed for blocks by another man who repeatedly called him "a dirty cop" and shouted, "You’ll be dead real soon."

David Sivella, who lives on the Upper East Side near where he took the video, initially tweeted it out last week and shared it again Wednesday following the release of another clip showing two teens brawling with NYPD officers on a Manhattan subway platform over the weekend.

Sivella’s video, recorded around 1:30 p.m. on July 19, shows a man wearing long sleeves and pants in 90-degree weather, carrying a Dunkin’  bag and sipping from a Big Gulp cup.

He told Fox News Digital Wednesday that the unidentified man started following him between 96th and 95th streets on Lexington Avenue. 

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Closeup of the man on Lexington Avenue.

The man declined to give his name when asked by the person he was allegedly trailing and threatening. (Courtesy/David Sivella)

"The guy was off the wall," he said, and he began recording the encounter.

At one point, Sivella asked that man for his name.

"You got all my information, dirty cop," the man says in the video. "You’ll be dead real soon, dirty cop. Call your friends at the 17[th precinct]."

"He followed me to 92nd Street, where I found a traffic officer," Sivella said. "I told the officer this guy was following me, threatening to kill me."

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David Sivella records the man over his shoulder

Upper East Side resident David Sivella said the man followed him about five blocks down Lexington Avenue before he encountered a police officer, and the man turned toward Central Park. (Courtesy/David Sivella)

Sivella said the officer asked if he had been assaulted, and he said no. He said he was told, "We can’t do anything unless they assault you."

Sivella said he offered to press charges "if it helps you get this guy off the streets and get him some help."

The NYPD said it had no complaint report on file for the incident.

Sivella said the man seemed "emotionally disturbed" and that they’d had no interaction before "he locked onto me, assuming I was a cop he knew."

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The man is walking in a crosswalk

The man seen crossing an intersection in a screengrab from video. (Courtesy/David Sivella)

"I’m 61," he told Fox News Digital. "I’m not into street fights."

Sivella, who also overheard a nearby shooting on June 29 that left a 20-year-old mother dead while walking her infant in a stroller, said rising crime in the city is a major concern.

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"This is an economic decline and crime crisis reset," he said. "Difference? Politicians have shifted to [a] blind spot on this stuff, and I’m a Democrat. … New York has some tough years ahead."