I was told about a brother who kidnapped his wife at gunpoint...it was found out later that the elders were aware of his cache of guns, he was preparing for the end.
Another sister was lucky the gun jammed as her JW hubby pointed it at her head and pulled the trigger.
Of course, there is the Bryant family's sad story, DF'd dad kills family and self.
http://www.portlandmercury.com/2002-07-18/feature-2.html
Then Christian Longo who killed his family and went off the Mexico with a woman.