Kenneth Eugene Smith becomes first person to be executed by nitrogen

Kenneth Eugene Smith has

The convicted killer, 58, was put to death in the William C. Holman facility's execution chamber in Atmore, .

After the reading of his last rights, a tight gas mask was placed over Smith's nose and mouth, before a stream of 100 percent nitrogen gas suffocated him. The gas mask remained on his face for 15 minutes to ensure the murderer was dead.

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