US financier Jeffrey Epstein has been found dead in his prison cell while awaiting trial on sex trafficking charges.
His body was discovered at 06:30 local time (10:30 GMT) on Saturday at a facility in New York.
Officials said his death was an apparent suicide. The FBI is investigating the incident.
Epstein, 66, pleaded not guilty to sex trafficking and conspiracy charges last month and was being held without bail.
“[He] was found unresponsive in his cell in the Special Housing Unit from an apparent suicide,” a statement from the justice department said.
“Mr Epstein was transported… to a local hospital for treatment of life-threatening injuries, and subsequently pronounced dead,” the statement added.
Last month, shortly after he was denied bail, Epstein was found semi-conscious in his cell with injuries to his neck. He was treated at a nearby hospital, reports said, before being returned to the Metropolitan Correctional Center in New York.
The facility is considered to be one of the most secure in the country.
There are conflicting reports as to whether Epstein was placed on suicide watch following that incident, which prison officials have been investigating as a possible suicide attempt.
But US media report that, despite the apparent warning signs, the financier was not on suicide watch at the time of his death.
Attorney General William Barr said there were “serious questions that must be answered”. He added that he was “appalled” by the news and said the justice department had opened its own investigation.
Epstein’s death comes a day after hundreds of pages of court documents were released that revealed new allegations against him and some of his associates.