The GBI is investigating after an Atlanta police officer shot a man in Atlanta on Christmas Eve, according to law enforcement officials. (AJC FILE) The GBI is investigating after an Atlanta police officer shot a man in Atlanta on Christmas Eve, law enforcement officials said. The officer, who was not named in the Georgia Bureau of Investigations report, fired several shots at Joshua Knox, 31. He was taken to Grady Memorial Hospital for treatment and was alert and conscious at the time.