Before Thursday, no execution had ever been carried out in the U.S. using the method, and experts have repeatedly warned that nitrogen toxicity may cause the condemned person to suffer unnecessarily ...

Tennessee death row inmate Harold Wayne Nichols on Monday declined to choose between the electric chair and lethal injection for his Dec. 11 execution, meaning the state will default to lethal ...

Anthony Boyd was the eighth person executed by nitrogen gas since Alabama began using the method last year. His execution came over the strenuous objection of three liberal Supreme Court justices. By ...