It seems to me an involuntary manslaughter charge would be in order. not to satisfy the public ,but the young man is dead. I feel like it could have been avoided. if I were in zimmermans shoes ,I wouldn't have shot the boy.I agree with you fully.
He should be paying out the nose, certainly. And there is enough here for the civil case against him to be staggering. But I see no Criminal Case, unless they prove he threw a punch. Then an Assault charge perhaps.
my understanding of criminal law is limited.