- Kenneth Eugene Smith executed by nitrogen hypoxia in Alabama, marking a first for the death penaltyCBS News
- Kenneth Smith: Alabama executes man by nitrogen gas for the first time in the US | LiveNOW from FOXLiveNOW from FOX
- Alabama completes first nitrogen gas execution | REUTERSReuters
- Mengele-like logic underpins Alabama’s plan to gas a man to deathMontgomery Advertiser
- Alabama has executed a man with nitrogen gas, the first time the controversial new method has been used in the U.S.The Killeen Daily Herald