It can't be reversed after they're dead.
You also can't give them back the time that they lost.
I don't have an issue with the death penalty.
The pushback against the death penalty and the idea that prisons are for "rehabilitation" instead of punishment is really just new-age nonsense by people who are afraid of the real world.
It's why we pretty much only see them making these arguments on the internet; it's the only place they can survive.
How do you give them compensation after they've died in prison?