My maternal grandfather murdered his second wife (not my grandma, the wife after my grandma) in cold blood in 1986 I believe... I had just been born shortly before, so this is all what my mom/family has told me.
Basically he was always a shitty person before that, very emotionally and physically abusive. Your typical controlling Italian husband. He emotionally abused the shit out of my mom and her siblings and they're still fucked up from it, but in a Stockholm syndrome kind of way... it's sad really.
Anyways, when my mom and her siblings were around 15/16 he split. Left my grandma with 3 kids and ran off with his much younger new woman. Couple years later they married and he knocked up the new lady and they had 2 kids. His treatment of her wasn't any different than that of my grandma and mom though. Constant emotional and physical abuse finally led his second wife to pack up the kids and leave him without warning. She took the kids to her hometown a few hours away from here and went and stayed in the women's shelter with them until she got back on her feet.
Thus obviously didn't fly at all with him though. He snapped at the notion of someone he thought he had complete control over suddenly having left and taken his children with her. So he as soon as he found out where she was he went there to see her.
When he got there he played nice and arranged for a meeting with her at the shelter she was in. Meeting day came and he went to the shelter and they were both put in a small room with a door and sat across a table from one another. They started talking and very quickly things began getting heated, when suddenly my grandfather stood up and without warning pulled a gun out stuck it to his wife's forehead and pulled the trigger. He blew her head off in the woman's shelter she was staying in to be protected from him.
Now this was the late 80's and nothing like this had ever happened anywhere before, which is why there was no supervision for the visit and no patdowns before entry. There'd never been a case of a woman being killed in protective custody like this before so it pretty much changed everything in regards to how security procedures were implemented from there on out.
He spent the next 20 years in prison and was let out in I believe 04 for good behaviour, (this is in Canada so no capital punishment and life sentences usually only carry 25 years max with good behavior). I met him and knew what the whole story was before meeting him. He was nice to me but I never went out of my way to form a connection. It was very obvious to me right away what a manipulative person he really was. He basically said whatever he needed to say to get what he wanted from my mom and her siblings.
My mom and her siblings did everything they could to help him get back on his feet, which amazed me since they always talked about how abusive he was and how absent he was. And the old man knew they were still stockholmed. He played on every single heart string he could to get what he needed to get back on his feet and within 3 years of being let out here some woman bought a small house a town over and stopped talking to my mom and her siblings all together. They were devastated again that their dad who abused them growing up, and killed one of his wives had used them and abandoned them again.
And not some 2 years after that, the old man had a freak out on the woman he was with... Flipped out over who knows what, cut her in a struggle and went on a fucking police chase until he was caught and is now sitting in prison again until he dies this time.
This is all unsurprising to me but my mom and her siblings are still so fucked up they feel bad for him and somehow try to rationalize his behaviour or theorize that maybe his woman set him up somehow...
I don't indulge those conversations because I know he's where he belongs.