There was a guy in my neighborhood growing up who's daughter was murdered in her bedroom while he and his wife were at a party one night a couple of houses down the street in the late 80s.
He was suspected and a lot of people in the neighborhood thought he did it (My dad always said there was no way he did it). Nobody was charged for the crime
Well as you can imagine the whole thing was extremely stressful and destroyed hi marriage and his career.
20 years later they reopened the case because of knew DNA technology, ran samples from all of the suspect and found a match. It was some dude who was doing odd work for the father. He thought the father was stiffing him on money so he murdered his daughter.
Crazy stuff. Spent 20 years of his life surrounded by people that thought he killed his own daughter.