Howard said last month that he anticipates seeking an indictment from a Grand Jury against Fisher before the end of July.
"We have concluded that at the time of the incident, Officer Fisher was acting in the capacity of a private security guard attempting to make an armed arrest of Mr. Miller without sufficient probable cause or legal justification," Howard said following Fisher's arrest.
According to records obtained through the Georgia Open Records Act, Fisher's only disciplinary file shows only an investigation for gun usage. But no details are available because the file refers to an open case.
Fisher, 40, had been with the police department for 17 months and on the street for less than a year.
Records obtained from the Atlanta Fire Department, for which he previously worked for 17 months, showed an acrimonious departure.
Fisher resigned without giving adequate notice, just days before starting at Atlanta's police academy.