Full Story: ATHENS, Ga. (AP) -- Two Oglethorpe County store owners were acting in self defense when they fatally shot two people they said were trying to rob them, the Georgia Bureau of Investigation has found. The GBI's announcement came Monday after a monthlong investigation into the shooting. Bobby Doster and his wife, Gloria Turner, say one of the teenagers fired at Doster while trying to rob the store Jan. 24. But the couple fired back with guns of their own, killing Michael Dewand Hill, 19, and Calvin Dantrell Ballard, 17. In a statement, Northern Judicial Circuit District Attorney Bob Lavender, said the investigation is closed and no action will be taken in the case. "After discussing victim and witness accounts, crime scene documentation and forensic evidence submitted to and examined at the GBI Crime Lab, authorities have concluded that the manner of the deaths were the result of justifiable homicide," Lavender said.