An inmate's death over the weekend at the High Point Detention Facility is under investigation, according to a news release from the Guilford County Sheriff's Office.Officers conducting a supervision round found Charles Williams, 61, unresponsive in his cell Sunday night. Guilford County Emergency Services arrived after officers performed initial life-saving measures and assumed care of Williams. He was pronounced dead at 10:14 p.m.Deputies said there was no apparent external trauma to Williams. The Medical Examiner's Office will be performing an autopsy to determine his cause of death.Per Guilford County Sheriff's Office policy, an internal investigation, as well as a criminal investigation, have been initiated.