My middle-aged cousin beat his elderly father to death with a hammer in his own home, then killed himself. They lived next door to each other. This was the affluent side of the family, nobody suspected anything was wrong and we still don't know why, except that it was mental illness and he skipped his meds.
Years ago, a guy I worked with was murdered by his son - the kid was about 15, shot and killed his mother and sister in the home, then waited for his dad to come home and shot him to death in the garage. It was so sad when someone called the office for him the next day, I was in tears transferring the call to HR for them to give the news. The kid/killer is still in prison (he's gotta be close to 50 now)
Oh, and when hubs and I were first together, a 'friend' of his stole money from him...a few months later the guy was found strangled, on his knees leaning over his bed with his hands tied behind his back (they printed the picture in the newspaper). It wasn't us! But we didn't shed a tear for him, he was a bad dude and got on the wrong side of someone badder than him.
Thank God I've never personally been a victim of a violent crime, I'm so sad to read all the stories of what you've all been through. Like minds gravitate to each other <3