Given the undeniable evidence of guilt, and an individual showing no sign of remorse for what they have done or even attempted to do. I would have no problem whatsoever signing a death warrant for such a person, none whatsoever!!
Saying that, i am generally talking here about the new breed of Islamic terrorists. They are, in my mind not your everyday normal criminals, and should never be thought of or treated as such. Most seem to want to die and become a martyr anyway, so i would be more than pleased to help them on there way....
As for sentencing general criminal types to death, I would need to be 200% sure that the individual(s) involved, was indeed guilty, and that his/her deeds deserved the death warrant. Under normal (if you can call it normal) circumstances, straight forward 1st degree murder, i would consider to be a life sentence without possibility of parole etc!!
David.....