Alabama inmate Kenneth Smith executed with nitrogen gas, marking the emergence of a wholly new method of capital punishment.

Alabama inmate Kenneth Smith executed with nitrogen gas, marking the emergence of a wholly new method of capital punishment | CNN
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Alabama inmate Kenneth Smith executed with nitrogen gas, marking the emergence of a wholly new method of capital punishment | CNN

Alabama has put to death Kenneth Smith, the first death row inmate known to die by nitrogen gas, marking the emergence of a wholly new method of execution in the United States.