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Alabama plans to put a respirator mask over Smith’s face and replace the air he is breathing with pure nitrogen gas, causing him to die from lack of oxygen. The execution will be the first ...

Nitrogen, a colorless, odorless gas, makes up about 80% of the air we breathe. It isn't deadly until it is separated from oxygen.

A death row inmate in Alabama was executed on Thursday, Jan. 25, using nitrogen gas. It marked the first U.S. execution carried out this way.

The inmate, Kenneth Smith, who was convicted in a 1988 stabbing murder, will be put to death by inhaling nitrogen gas, a method known as nitrogen hypoxia. Supporters of the method say it is fast ...

Death by nitrogen hypoxia deprives the brain and body of oxygen, so the inmate would die by suffocation, according to the Death Penalty Information Center, a non-profit that monitors, analyzes and ...