Surveillance video of the jailhouse area outside accused child sex trafficker Jeffrey Epstein's cell from the time of his first reported suicide attempt in July is now missing, an attorney for Epstein's former cellmate said Wednesday night.

Attorneys for the cellmate, an ex-police officer accused by federal prosecutors of four murders, had been seeking the video since two days after Epstein, 66, allegedly tried to kill himself in the Metropolitan Correctional Center on July 23.

"We were told that it was not retained," one of the lawyers, Bruce Barket, said in an email to CNBC.

"Obviously if it was destroyed or lost, that is disturbing," Barket said. "We are waiting on an explanation before deciding how to proceed."

Earlier Wednesday, the New York Daily News and the New York Post reported that prosecutors told a federal judge that no one can find the surveillance video from around Epstein's cell for the hours before he was found semiconscious, with marks on his neck, on July 23 in the cell he was sharing with Nick Tartaglione, a former police officer from Westchester County, New York.

That incident occurred weeks beforewhat authorities have said was Epstein's death by suicide in the same federal lockup.

Tartaglione claims that he saved the life of Epstein, a former friend of President Donald Trump and former President Bill Clinton, during the first suicide attempt.

His attorneys asked for the videos days after the incident to use as possible evidence if he is convicted of the four murders that he is charged with, which could carry possible death sentences. If the video shows Tartaglione helping Epstein, it could bolster an argument that he should not be executed.

The cell where both men were housed is in a unit for prisoners who are considered at risk of violence from other inmates in the general population area of the jail or who themselves pose a risk of violence. Guards at the jail are required to conduct multiple scheduled head counts of inmates and to conduct rounds of the facility.

U.S. District Judge Kenneth Karas of Manhattan has asked prosecutors to continue investigating what happened to the video.

A spokesman for the U.S. attorney's office in Manhattan, which was prosecuting Epstein and is still prosecuting Tartaglione, did not immediately respond to requests for comment from CNBC.

Epstein was being held at the jail without bond after his arrest in early July on charges of allegedly trafficking dozens of underage girls from 2002 through 2005 at his massive townhouse in Manhattan and his Palm Beach, Florida, mansion to satisfy his sexual obsessions.

He was already a registered sex offender, having pleaded guilty to soliciting sex from an underage girl and another charge in Florida in 2008, crimes for which he served 13 months in jail, albeit while able to be free on work release for much of the that time.

After the suicide attempt in July, Epstein was briefly placed on suicide watch and then placed on psychological watch for several days.

Less than a month later, Epstein died by suicide in his cell, where he no longer had a cellmate, authorities have said.

Video surveillance shows no one entering or leaving Epstein's cell after he went into it on the evening of Aug. 9, according to federal authorities. He was found unresponsive there on the morning of Aug. 10.

Epstein's death ignited conspiracy theories that he had been killed because of his association with powerful, rich and famous people, including Prince Andrew of Britain.

Epstein's lawyers have said they are skeptical of the ruling of suicide, citing a report by a forensic pathologist hired by Epstein's brother who said his injuries were "more indicative of strangulation — homicidal strangulation."

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While federal authorities have said Epstein himself, the incident is under investigation by several agencies.

Two guards were arrested in November on federal charges related to their alleged attempt to cover up their failure to check on Epstein in the hours before his suicide.

The guards, Michael Thomas and Tova Noel, allegedly browsed the internet and appeared to have been asleep for about two hours during the time that they were supposed to have been making sure that Epstein and other inmates were safe and accounted for in the special housing unit.

The judge who oversaw Epstein's case said in a letter to The New York Times that "it is unthinkable" that any inmate — let alone one with such a high profile as Epstein's — would die in custody.

Judge Richard Berman also called for reforms in the prison system in light of Epstein's death.

If you or someone you know is in crisis, call the National Suicide Prevention Lifeline at 800-273-8255, text HOME to 741741 or visit SpeakingOfSuicide.com/resources for additional resources.