ATLANTA — The investigator was soft-spoken, but relentless.
"Look at me and tell me that you were not in that gymnasium," said Trebor Randle, a Georgia Bureau of Investigation agent, sitting across a small table from the corrections officer.
"And then what?" said Sgt. Christopher A. Hall, his voice a choked whisper. "What happens to me?"
A month earlier, in December 2010, Hall led an emergency response team at Macon State Prison in central Georgia responding to a fight between an inmate, Terrance Dean, and a guard. Hall's team broke up the fight, handcuffed Dean, and took him into the prison gym. Dean emerged with a massive head injury, comatose and clinging to life.