Can you revoke the death penalty ?

Death penalty as irrevocable - One aspect of the death penalty that we can't ignore is that it is absolutely irrevocable. Once somebody is put to death, once (describe briefly the relevant manner of death, e.g., once the potassium cyanide pellet is dropped, once the lethal poisons flow into the vein,etc.) and the agony of the death throes is over and the person is pronounced dead, that's the end of it. That's the end of the case for (name the defendant). No matter what might happen in later years, it wouldn't matter because once you've killed him you can't bring him back.