A South Carolina man on death row has chosen to be killed by firing squad, and if his execution goes forward next month, it would be the first time in 15 years that capital punishment in the US is carried out by gunfire. Brad Sigmon, 67, is scheduled to be shot to death on 7 March, part of a spate of rapid killings the state has pursued in the last six months as it revives executions after a 13-year pause. South Carolina now directs those on death row to choose how they will be killed -- electric chair, lethal injection or shooting. If they decline to make a selection, the state electrocutes them. Attorneys for men on South Carolina's death row have previously objected to firing squads, raising concerns about the pain caused by shootings and arguing the method constitutes cruel and unusual punishment. But Sigmon selected a firing squad in part because of concerns about the state's lethal injection methods, his attorneys said.