It remained unclear if he had been placed on suicide watch after his first attempt at suicide on July 25, when he was found unconscious in his cell with bruises on his neck. The federal Bureau of Prisons did not immediately respond to requests for information.

Mr. Epstein had been housed in a cell with Nicholas Tartaglione, a former police officer facing murder charges. It was unclear if he was still being held with another inmate as of Saturday morning.

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Suicide prevention cells must provide an “unobstructed view of the inmate” and “may not have fixtures or architectural features that would easily allow self-injury,” according to Bureau of Prisons policy.

According to a person familiar with the Bureau of Prison’s procedures, the cells are equipped with video monitoring, which an officer monitors around the clock.

An autopsy found that financier Jeffrey Epstein sustained multiple breaks in his neck bones, according to two people familiar with the findings, deepening the mystery about the circumstances around his death.

Among the bones broken in Epstein’s neck was the hyoid bone, which in men is near the Adam’s apple. Such breaks can occur in those who hang themselves, particularly if they are older, according to forensics experts and studies on the subject. But they are more common in victims of homicide by strangulation, the experts said.