269 Let us keep in mind that “not even a murderer loses his personal dignity, and God himself pledges to guarantee this”. The firm rejection of the death penalty shows to what extent it is possible to recognize the inalienable dignity of every human being and to accept that he or she has a place in this universe. If I do not deny that dignity to the worst of criminals, I will not deny it to anyone. I will give everyone the possibility of sharing this planet with me, despite all our differences.
Source: Fratelli Tutti (Vatican.va)