Agreed as well, this is why I don't really buy the victim of a crime angle. If he was killed they would most likely have left his body right where the act took place.
My belief is that he walked out on his family ... some here will disagree and that's ok. If we all thought alike we would never get anywhere.
I agree that a stranger would leave the body, but someone who knew him may not. It could have been calculating and planned crime. Yet, I agree that RM could have took off too. So many possibilities . .