- Supreme Court Declines to Stop Nitrogen Execution in Alabama The New York Times
- US Supreme Court declines to halt execution of Alabama inmate set to be the first to die by nitrogen gas CNN
- Alabama death row inmate facing nitrogen hypoxia execution loses last ditch appeal Fox News
- Kenneth Eugene Smith: US inmate faces first nitrogen execution after losing last-minute appeals BBC.com
- Canadian firm under fire for supplying equipment for Alabama execution The Guardian
