This seems like an unusual case where a guy murdered once and lived in the same area for decades afterwards without repeating a crime of violence with any similar characteristics. The fact that, at the time, he lived within 4 miles of the victim probably doesn't play into things much if they probably met at a club.
It's tragic of course but it's not clear that there's much to be learned for law enforcement from this other than that some people can go very far off the deep end once in their lives and not repeat it.
It's tragic of course but it's not clear that there's much to be learned for law enforcement from this other than that some people can go very far off the deep end once in their lives and not repeat it.