The records do not show who paid Stafford's bond.
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Authorities say Stafford ran down the steps from his cell Thursday morning and attacked Roof after his cell door was not locked as it was supposed to be. The jail is doing an internal investigation.
Roof's face and back were bruised. He refused to press charges against Stafford.
Roof, who is white, is charged with killing nine black churchgoers in June 2015. Stafford is black.
