Jeffrey Epstein’s former Manhattan cellmate says guards at the lockup have been threatening him since the financier’s death, according to a legal filing by his attorneys Tuesday asking a judge to move him to a new prison.

Hulking ex-cop Nicholas Tartaglione — who briefly bunked with Epstein at the Metropolitan Correctional Center — has been told by various guards there to “shut up,” “stop talking” and “stop complaining,” as questions swirled about how the accused sex trafficker was able to commit suicide in federal custody, Tartaglione attorney Bruce Barket says in a letter to White Plains federal Judge Kenneth Karas.

Tartaglione was sharing a cell with Epstein during what’s believed to have been the 66-year-old’s first suicide attempt, on July 23. The two were separated before Epstein hanged himself on Aug. 10.

“The clear message Mr. Tartaglione has received is that if he conveys information about the facility or about [Epstein’s] recent suicide, there will be a price to pay,” Barket’s letter reads. “Whether or not the investigators into the suicide chose to interview Mr. Tartaglione about the attempted suicide to which he was witness or about how the facility is run and the conditions under which the inmates are forced to live, the correction officers know he has information potentially very damaging to the very people now charged with guarding him or their coworkers.”

The 51-year-old former Briarcliff Manor cop is facing the death penalty for his alleged involvement in four drug-related slayings upstate.

While Epstein told his lawyers that Tartaglione was behind his July neck injuries, Barket fiercely denied that allegation.

Barket’s letter also cites the “deplorable” conditions — including “a serious rodent and insect infestation” — at the MCC as a reason to move his client, who is due in court Wednesday for a hearing.

The MCC did not immediately return a request for comment.