Only when the justice system has proven w/o reasonable doubt.
Then, yes, I support the death penalty.
Why waste tax dollars from innocent citizens to feed and house a convict who deserves the death penalty?
As Castafiore said, executing someone is actually more expensive than life sentence.
And secondly, if money is a concern, I fail to see how killing the person is the best solution. I propose making the prisoners work until they pay for their expenses at the very least.
Death penalty is a barbarity. And the Troy Davis case is a legalised crime.