Guy who shot McKnight is being charged with manslaughter.
I don't know all that legal mumbo jumbo, but I'd imagine that's prolly for the best, since it would be near impossible to get a murder conviction with the reported circumstances and Louisiana carjacking laws as they are. There really doesn't seem to be much concrete info available, so grain assault and all, but if it was some sort of road rage incident that both sides were involved in, manslaughter would probably be the best charge on which to actually get a conviction.
I really think that's part of why George Zimmerman walked. The state spent the whole trial arguing for a 2nd degree murder conviction, and then at the 11th hour they hamfist on some jury instructions about considering manslaughter as well? Had they approached the case with manslaughter conviction in mind from the beginning, I think they would have had a better chance, especially since Zimmerman instigated the initial confrontation (but it is Florida, so who knows).