A man shot in the head early Saturday outside of a closed bar in Gloucester County has died of his injuries, authorities confirmed Wednesday. Charges already filed against the alleged gunman were upgraded Wednesday to include murder, according to the Gloucester County Prosecutor’s Office. Walter J. Gilliano, 25, of Franklinville, allegedly shot Chad Stuart, 31, of Clayton, following an argument outside of Villari’s Sports Bar on Coles Mill Road in Franklin Township. Officers responded to the scene around 4:45 a.m. Saturday and found Gilliano rendering aid to Stuart, according to an affidavit o…