Ray Cromartie, 52, who has long denied that he pulled the trigger in the killing, was executed by lethal injection at 10:59 p.m. EST at the Georgia Diagnostic and Classification Prison in Jackson, the state's department of corrections said.
Cromartie maintained his innocence until the end.
The two robbers failed to get the store's cash register open but Cromartie grabbed two 12-packs of Budweiser beer and they fled the scene, according to court records.