I am friend with someone who was charged for participating and (unknowingly at the time) erasing evidence of her friend's father murder. She was 15. From what she said it was all an accident and they didn't actually try to kill him (I believe that) but things went wrong and the man died. Must have been awful for everyone involved and my friend has felt forever guilty ever since.
My great grandfather (who is still alive but have met only once) tried to kill his second wife, shot her in the neck with a gun, but she thankfully survived (he surprisingly wasn't jailed). I met him on my 13th birthday and he seemed a lovely old man, was shocked when I found out what a horrible human being he is.
My father tried to kill my mum, she was rescued by a neighbour, again my father was never jailed and is still happily living his life. (The French justice system is a bit crap I believe)
Apart from that, my hometown got famous because a guy who had recently left jail had raped and killed a girl and scattered her body parts around the city. Leading to drastic changes to the justice system and stricter sentencing. And because a man killed his wife and 5 (adults) children and burried them under the patio before telling his family they were immigrating to the US and that they probably wouldn't hear back from them for a while (he is still on the run).
My aunt also found body parts in a plastic back while on a romantic getaway to a lake. She never found out who the body belonged to or anything, but this story totally gives me the creeps and I feel oddly weirded out everytime I go to forest/lake areas.
I find all those stories quite depressing as it makes me even more cautious of how unsafe the world is and how no one can really be trusted.