A Manhattan judge took mere seconds Friday to find a prosecutor guilty of strangling a woman during a drunken Halloween bar brawl.

Judge Ann Scherzer immediately rendered her verdict after an assistant district attorney uttered the last sentence of her closing argument following a weeklong bench trial.

“I do find that the people have proven beyond a reasonable doubt that you committed the crime of assault, criminal obstruction of breathing and harassment,” Scherzer told defendant Eli Cherkasky, a Manhattan prosecutor whose dad Michael, a former top lawyer in the same office, was sitting in the gallery.

Cherkasky, 35, stood, his mouth agape, clearly shocked. The judge acquitted him of the lesser charge of menacing.

Cherkasky resigned from his job with the Manhattan District Attorney’s Office hours later. He had been suspended without pay since his arrest last fall.

Victim Kirsten Schuck sat in the court gallery for the proceeding with NYPD Detective Martin Pastor, who brought the misdemeanor case against Cherkasky. She didn’t react to the verdict.

But the 32-year-old woman had repeatedly broken into heaving sobs when she testified against Cherkasky last week, telling the judge she thought he was trying to kill her.

The fight began during the early hours of Nov. 1, after a night of heavy drinking, when Cherkasky began searching for his coat inside the Failte bar on Second Avenue.

He picked up Schuck’s purse and scarf from a chair, and she angrily told him not to touch her things.

The dispute between the drunken strangers quickly escalated.

“He screamed at me, ‘You c- -t!’ and started rushing toward me,” she said. “I splashed beer in his face. I thought it would slow him down or stop him.”

Schuck said that Cherkasky slammed her into a railing, then dragged her to the floor and repeatedly choked and slapped her. It took four men to pull him off her.

Bronx ADA Nicole Donatich, who prosecuted the case after the Manhattan District Attorney’s Office recused itself, called the attack a “nightmare” that Schuck “will never forget.”

But defense lawyer Paul Shechtman insisted that Schuck was the real aggressor and slugged Cherkasky and tossed beer in his face before clumsily falling against the railing and injuring herself.

“Miss Schuck’s testimony was false,” the lawyer said. “It was dramatically false. It was drama. She needed two breaks during direct examination. She began crying at the outset, she began crying again and needed a break, she even cried once on cross-examination.”

“Her motive is hard to know, but here’s an obvious one Miss Schuck seems to enjoy the spotlight,” he added.

Grainy surveillance video captured the moments leading up to the altercation but not Cherkasky choking her.

He faces a maximum of one year in jail when he returns to court for sentencing Nov 5.