Alabama executes Kenneth Smith using untested method of nitrogen gas
theguardian.com
theguardian.com
In light of that goal, it seems like a firing squad or even a guillotine would be a better choice? From the article, it sounds like this process drew things out much longer than it really should have.
Ask why you weren't told this.
Seriously, the US system is a mess that this was allowed to happen. Along with the US only a few counties still have the death penalty, and many of them haven't done one for >20 years, meaning it is effectively gone.