I support the death penalty when there is ample evidence...like matching DNA, recorded video, and or a confession.Here is a case where a man is currently serving a life sentence for rape, based at least in part on the fact that the State of Florida mislabeled the DNA used for the test.
It turns out that the DNA claimed to belong to the defendant really belonged to the woman's boyfriend.
I haven't followed the case, so I don't know how strong the rest of the case was, but this is a clear reminder that even things like DNA can be wrong or misleading because of the possibility of human error.