The Clayton County Sheriff's Office said the deputy, who is white, was fired for excessive use of force in the encounter Friday with Roderick Walker, 26.
A criminal investigation was being turned over to the Clayton County district attorney's office, the sheriff's office said in a statement.
An attorney for Walker, Shean Williams, said Saturday that Walker was a passenger in a car that was pulled over for having a broken taillight.
"Why are you asking for my ID?" Williams quoted Walker saying.
After authorities told Walker to get out of the car, Williams said, the deputies "attacked" him!
The Clayton County Sheriff's Office said in the statement that Walker received medical treatment, including X-rays, and that no fractures were found.
The sheriff's office said Sunday that Walker would have been released on his own recognizance but that he was being held on an outstanding felony probation warrant for cruelty to children and possession of a firearm by a convicted felon, as well as another warrant for failure to appear
Referring to those cases, Gerald Griggs of the NAACP in Atlanta said Saturday that he and others are demanding that Walker be released but that they could be mourning his life
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