What I said in my first post remains true even with all your pages of excuses and technicalities. Even in your worst case scenario, that the guy was a *suspected burglar* who got killed after going for the killers' gun, they are still murderers.
The fact that it took a public outrage to get an investigation is a crying criminal shame. The fact that an arrest happened because of media attention is an issue, but in the context of a man getting killed by macho wannabe cowboys, and a blatant coverup by a DA, renders it all but insignificant.