Eyewitness error sent Michael Sabol to the penitentiary, where he died before evidence of his innocence came to light
Michael Sabol was sentenced to death along with Andrew Toth and George S. Rusnok for a murder that occurred in 1891 during a riot at Andrew Carnegie's Edgar Thomson Steel Works in Braddock, Pennsylvania. Twenty years later, evidence of the innocence of Toth and Sabol came to light. Toth was declared innocent and released. Unfortunately, the new evidence came to late to help Sabol, who had died in the penitentiary several years before.
For details, see Andrew Toth.