I gotta agree with Mr. Mann on this one, let the bastard swing by his neck until dead. Lethal injection, firing squad, and electric chair are too easy of outs for what he did. Put the rope around his neck and make him wait for the door to open, with any luck the fall won't break his neck and he slowly strangles. That or give him over to the families of the dead and injured, they may have an even more creative method for administering justice.