Joe Arridy, a man with an IQ of 46 and the “happiest prisoner on death row.” He spent his time on death row playing with a toy train, and he went into the gas chamber with a smile.

Joe Arridy was a mentally disabled 23-year-old who was falsely accused of rape and murder of a 15-year-old schoolgirl in Pueblo, Colorado. Evidence provided by then Colorado Governor Bill Ritter, a former district attorney, after research had shown that Arridy was likely not in Pueblo when the crime happened and had been coerced into confessing.