It is being reported that staffing shortages at the prison where financier Jeffrey Epstein was found dead left gaps in his supervision.
The union for the facility's employees made the disclosure Monday.
The justice department and the FBI have launched investigations into his death in New York, amid questions surrounding the circumstances.
The 66 year old Epstein was facing sex trafficking and conspiracy charges, which carried jail sentences of up to 45 years.
A post mortem 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.
Dr. Sampson added that a private pathologist observed the examination at the request of Epstein's representatives.
His body was found in his cell early Saturday morning.