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Yes. He was convicted with his partner Sonia Jacobs, who walked in 1992 and was at the well-publicized Wrongful Convictions & the Death Penalty conference in Chicago last year. She doesn't make the official list of innocent people (which now numbers 80, vs. 559 executions) because to get out she accepted a plea bargain. But Tafero's case is widely regarded as the single most certain instance in recent years of an innocent person being executed.
BTW, Sonia got out because an outside filmmaker got interested in the case and dug up the information. It wasn't a case of the system working; it's a total fluke that she's alive today.
See: http://www.essential.org/dpic/dpicrecinnoc.html
Jason