Officer: Jail inmate assaults man charged in church massacre
The 22-year-old Roof was examined by jail medical personnel and then returned to his cell, Charleston County Sheriff's Maj. Eric Watson told The Associated Press
The 26-year-old Stafford is awaiting trial on first-degree assault and strong armed robbery charges.
Defense attorneys have said in both state and federal courts that Roof is willing to plead guilty and serve a life term in prison if prosecutors don't seek the death penalty.