Here is what we know:

1) Martin was coming back from the variety store and heading to his dad's house. He was not a stranger to the neighbourhood, but had been going to visit his dad in the area for years.

2) Zimmerman saw a kid with a hoodie on. Called the cops and said "These assholes always get away" (after first identifying Martin as "a black wearing a hoodie."

3) Zimmerman (armed) starts following Trayvon (17 year old boy w/ no weapon).

4) Zimmerman approaches Trayvon (phone call w/ Martin's friend proves Martin was scared that someone was following him)

Then we don't know what happened. We know we can't trust Zimmerman's side of the story. It is useless and not evidence. We know that his head injuries were not life threatening. We know that there is a 17 year old boy who is dead. I don't know who started the fight. We just know Zimmerman approached him. We can't say who started the fight. What I am saying is that it doesn't matter who started the fight. You can't approach anyone at night without any reason (and after the police told you to stop following the person) and then kill the person when they did not lethally threaten you. This is manslaughter. Murder.