Nitrogen hypoxia has been approved as an execution method by three US states but has never been used. Lawyers for death row inmate Kenneth Smith say he should not be used as a "test subject" for the ...

Nine months after Kenneth Smith’s botched lethal injection, state attorney general has asked for approval to kill him with nitrogen Kenneth Smith is one of two living Americans who can describe what ...

Kenneth Smith, who was executed by Alabama, appeared to convulse during procedure, as critics have likened it to human experimentation Alabama has used a new method of execution: nitrogen gas. Kenneth ...

HOUSTON (AP) — Louisiana is set this week to execute a man by nitrogen gas, the first execution in the state in 15 years. Jessie Hoffman Jr., 46, is scheduled to die on Tuesday in Louisiana. He was ...