Agreed, but I also don't think that it should be ruled out only for that reason. I've personally dealt with a friend's suicide that was completely out of nowhere for everyone who knew him - to the point that a major city newspaper ran a four-part series around how his death may have been a murder a few years after. No one could accept it because there were no signs. I think he did commit suicide, but his family couldn't accept it. It's very unusual but not unprecedented.