Mark Epstein contests the FBI's conclusions regarding the suicide of his brother, Jeffrey Epstein, claiming that there is evidence of murder and negligence in the prison system.

Mark Epstein, the brother of Jeffrey Epstein, stated that he does not believe in the official version of the FBI, which claims that Jeffrey committed suicide in his cell on August 10, 2019. Mark was present at the identification of the body and mentioned that the forensic doctors could not conclude suicide, considering that the death resembled more of a murder. On the initial death certificate, the cause of death was noted as being "pending further studies." Mark Epstein accuses the Department of Justice of hiding the truth and claims that his brother was murdered, considering Jeffrey's statements during the 2016 elections.

The FBI released a statement in 2025, asserting that Epstein's death was a suicide, supported by surveillance footage showing that no one entered his cell area on the night of his death. However, the coroner hired by the family noted that Epstein had unusual injuries for a suicide by hanging, which fueled suspicions of murder. A report from June 2023 highlighted serious negligence in the prison system, including the fact that Epstein was left without a cellmate, despite previous suicide attempts. Although the official report concludes that there is no credible evidence of another cause of death, controversies continue to surround the circumstances of Jeffrey Epstein's death.