I remember reading a book a few years ago about a JW guy who had his own cleaning business, employed all brothers, him and his wife were the toast of the cong for a while there. Then things all started going horribly wrong, the guy cracked and killed his wife and three kids. It was a shocking story, written by a NYT journalist. I wasn't "awake" when I read it, but now I can't remember what it was called.
I suspect there could be many more of these types of cases than we think. Seems that being a JW does not guarantee immunity to all that worldly dysfunction and misery after all.