I seem to remember that the daughter stated there were two black men involved in this. I don't have a link, I am just going off of memory of things that came up in the beginning. I'm not sure if that was part of the supposed road rage incident or the shooting. I cannot find anything about it by Googling, so maybe I am all mixed up. If I did remember this correctly, what ever happened with that? Are police looking for these black men to get their story of what happened? They would surely be able to shed some light on this case.
You are correct about two black men being part of the initial story told by KM. Black guys were riding with spiky hair white guy with hazel eyes.

Why those violent road-ragers never seemed to be a concern to anyone after the fact is a mystery to me.