My top theory is personal crime involving hate (or revenge). Once a person has started to hate another person, and they let it fester, it will eat at them. There's a saying; Allowing yourself to hate someone is like burning down your own house to get rid of a rat. If that person also has a friend who is talking to them about how much that other person has wronged them, and treated them like $&%#, after all they've done for them... Then the two of them build off of one another's anger. I personally don't see that it would be hard to find someone who didn't like CR1, and some other members of his family, either by cause, or by extension. I'm not speaking ill of the dead, it's right there in the newspapers and FB. All it takes is for one person who is a bit mentally unbalanced, or just plain evil, to get ticked at someone, and start thinking, and just rolling a plan around in their head, until it starts to take shape. It's also extraordinary what people can talk other people into going along with, too. People, alone, who'd never have even thought about committing a murder, had they not met up with that specific person. Family will also protect family many times until they know, 100%, for sure, that they've actually committed murder.
There was a case in FL, twin men, who were convicted of murdering their long time friend, who was a reporter. The dominant twin did it, but the other twin helped cover it up. Their father, was called by LE, and had to ultimately bring himself to the realization, that what they buried in his back yard was very likely not their friend's dog, and then called LE back. I think I'd have figured it out way earlier, but, I guess your mind doesn't want to go there.
