Staffing shortages at the prison where financier Jeffrey Epstein was found dead left gaps in his supervision, said the union for the facility’s employees.
The justice department and the FBI have both launched investigations into his death in New York, amid questions surrounding the circumstances.
Epstein, 66, was facing sex trafficking and conspiracy charges, which carried jail sentences of up to 45 years.
A post mortem examination was performed on Sunday.
New York City’s chief medical examiner, Barbara Sampson, said more information was needed before the cause of death was determined.
A private pathologist observed the examination at the request of Epstein’s representatives, Dr Sampson added.
Epstein’s body was found in his cell early Saturday morning.
