IMO you can't convict this guy. Kid would have died anyways from the shot to the head.
Defense needs to call the medical examiner into question, get other medical examiners to say kid was already dead or would have died. Then the other bullets only pumping them into a dead body which isn't murder.
I'm on this jury I don't even listen. I just wait until vote time, not guilty, then go on my way.
No friggin way I could send a guy to prison for shooting someone the country is better off without. Someone who eventually would have probably killed himself.
If you use a weapon doing robberies, no doubt in my mind that eventually you have to use it.