I'd place him in juvinille detentin until age 18 and then prison for another 18 years. He's a murderer.
[video=youtube;bf88PURRsk0]http://www.youtube.com/watch?v=bf88PURRsk0[/video] Apparently the same judge recently sentenced a 14 year old kid to ten years for punching someone, that person fell and hit their head, killing them.