An inmate in the same unit where Jeffrey Epstein hanged himself heard nothing the morning of his death — but “knows a heck of a lot about what went on,” his lawyer said in a new report.

Nicholas Tartaglione, an ex-Westchester cop who faces the death penalty in a quadruple homicide upstate, was being held a few cells away from Epstein on Aug. 10, when he was found unresponsive around 6:30 a.m.

“Nobody heard anything. It was a silent act,” his lawyer Bruce Barket told NBC News.

Tartaglione was Epstein’s cellmate at the Manhattan Correctional Center when the convicted pedophile was first found nearly unconscious on the floor of his cell with injuries to his neck in July.

The hulking former Briarcliff Manor cop told investigators that he didn’t hear anything at the time and wasn’t responsible for Epstein’s injuries, sources previously told The Post.

Tartaglione has not yet been questioned about Epstein’s suicide, Barket said.

“Nick knows a heck of a lot about what went on,” the lawyer claimed to NBC. “He was there during the first attempt and he was there when he actually killed himself — he just wasn’t in the same cell.”

Tartaglione, 51, is awaiting trial on charges he murdered four men as part of a drug deal gone bad. He is accused of burying the bodies on his Otisville property.

“Whether or not he’ll be in a position to cooperate remains unclear,” Barket said. “But he certainly has information that would be very valuable to the investigation if they want access to it.”