It is also against the law to trespass. If they were on his property they need to face manslaughter charges. One thing is for sure they should be finished as cops.
Just because the cops were (presumably) on this guy's property, does that give the resident the right to shoot them in all circumstances? What if the resident came out, yelled at them and then started blazing away? It seems to me pretty clear that there aren't enough facts here to draw conclusions but that doesn't stop some people, obviously.