- Kenneth Smith’s execution condemned with 43 more death row inmates slated to die by nitrogen: UpdatesThe Independent
- Alabama AG calls first nitrogen gas execution ‘textbook,’ but witnesses say inmate thrashed in final momentsYahoo News
- Will other states replicate Alabama’s nitrogen execution?The Seattle Times
- Four minutes of convulsions: Kenneth Smith executed with nitrogen gasMontgomery Advertiser
- Alabama inmate Kenneth Smith put to death in first U.S. nitrogen gas executionNBC News