I agree. There have been way too many horror stories from lethal injections. The sentence is death. Not death by slow torture. We need to go back to hanging. And this guy needs to have his sentence commuted to life in prison w/o parole. Seriously. This is nuts.
So a screwup in the execution makes him any less deserving of death? I don't think so!
BTW, some animals are euthanized in a decompression chamber; they lock 'em in and suck out the air. If it's good enough for a stray dog or cat it's good enough for a criminal!