Chindie is absolutely correct on this. On it's face, it seems like Zimmerman should be heading straight to prison, but the arguable facts of the case could not add up to a conviction, at least for murder.
The best the Martin family can hope for is a wrongful death conviction, which could result in minimal prison time for Zimmerman. But maybe just enough for him to get "prison justice".
Anyway you slice it, he's a marked man as long as he draws breath. And his idiot brother would be smart to not give anymore interviews on CNN.