Yes.
Cat I grew up with killed his ex-girlfriend and some dude she was messing with. He was with her for a year or so, fell in love and was sprung on that p*ssy. She was a hood rat though. Dude was insanely jealous too. I mean we would be joking with him about her...innocent shyt and his mood would instantly darken and he would be ready to kill us for even mentioning her name (like Tony Montana and his sister type rage). Anyway, they break up and he goes into a depression...couldn't eat, sleep, lost his job, quit school. He finds out she was cheating on him damn near the whole relationship with some military dude and he began stalking her incessantly. He followed her home one night and just sat outside watching her house. Some dude (he was an innocent party to the whole situation) came over and he lost it. Grabbed his heat and pulled a kick doe. He found his ex and the dude in the house and killed them both. He just sat there until the cops came and they hemmed him up. Been locked up ever since. This was in '97/'98.