Alabama Carries Out Second Execution Using Nitrogen GasAlan E. Miller, convicted in three 1999 murders, appeared to shake and gasp after the gas began flowing, media witnesses said. The only other prisoner to be executed by nitrogen had a similar response.
Source: Alabama Carries Out Second Execution Using Nitrogen Gas (https://www.nytimes.com/2024/09/26/us/alabama-nitrogen-execution-alan-miller.html)