J.R. Walker was once a soldier in the United States Army. Later, he became an assassin working for the CIA. The CIA and Skip Ash sent Shotgun to retrieve Number 9, a young blonde woman. He wound up battling Daredevil. He has worked side-by-side with the Punisher at one point, teaming up with him to destroy the Carbone crime family. Shotgun had been hired to do this because the Carbones were not the 'tame' Mafiosi the government enjoyed. Shotgun saves the Punisher and the life of his ally Mickey Fondozzi. Shotgun and the Punisher then work to slaughter an isolated island full of international Mafia members. This particular battle results in the destruction of most of the Carbone family, a longtime target of the Punisher. Rosalie Carbone is left in charge.