A man with as IQ in 50s is convicted of murder in 1977 and goes off to prison. He appealed the decision and it was overturned in 1980 and a new trial ordered. Now get this: The defense lawyers and the prosecutors pretty much forgot about him. He was never retried, but he remained in prison. It wasn't until 2006 that a fellow inmate was looking into his case and came to the conclusion, "Something ain't quite right here."
And he's still in prison.
(There's been a
ton of press about this over the last couple of years, but I had never heard of it.)