Sen. Ben Sasse of Nebraska sent a furious letter to Attorney General William Barr following the apparent death by suicide of Jeffrey Epstein, telling the nation’s top law enforcement chief that the Justice Department “failed” in its duty to keep the alleged child sex trafficker alive while in prison and so “heads must roll.”

The Bureau of Prisons released a statement on Saturday stating that the jet-setting financier and sex offender was found “unresponsive in his cell” located in the Special Housing Unit at around 6:30 a.m. following “an apparent suicide.” Officials said lifesaving efforts were immediately undertaken and that Epstein was brought to a local hospital where he was pronounced dead. NYC’s Office of Chief Medical Examiner said that they “are investigating the cause of death” and “have an open case.”