The officer fired two shots when the man charged at him, said Cedric Alexander, the public safety director of DeKalb County.
But given that the man was not carrying a weapon, the police department immediately turned over the case to the Georgia Bureau of Investigations for an independent probe.
"What I have requested here [is] a result of what's going on currently across this country as it relates to police shootings," Alexander told reporters.
The officer was white; the deceased man was African-American, Alexander said.