Kenneth Smith has become the first-ever inmate to be killed by nitrogen gas after Alabama state officials used a gas mask to replace breathable air with nitrogen, depriving him of oxygen
Kenneth Smith: Execution through untested nitrogen method to take place in hours | news.com.au — Australia's leading news site news.com.au - get the latest breaking news, showbiz & celebrity photos, sport news & rumours, viral videos and top stories from news.com.au Daily Mail and Mail on Sunday newspapers.