Where their is absolutely no error for doubt and its positively proven by whatever means and a life or lives have been lost then I have no problem with the death penalty in such cases.
The biblical reasons for carrying out the death penalty is atrocious ,barbaric and words fail me.
However with the American judicial system where a man or woman can spend 10 ,or more years on death row is also barbaric ,that is nothing but cruel mental torture .
They need to overhaul their judicial system for people on death row.
There was controversy over the death of Carl Chessman who was on death row for over 11 years and if things had gone to plan maybe he would not have been executed at all and just spent x amount of time being incarcerated for his crimes.
That`s just my 2 cents worth.
I remember seeing the movie based on his book when I was a teenager .