Imprisoned more than half his life for a rape and murder conviction, 53-year-old Edward Lee Elmore, center, celebrates his 2012 release in Greenwood, South Carolina. Appellate lawyers Diana Holt and John Blume uncovered information suggesting that evidence was planted or hidden from defense attorneys. Elmore had been sentenced to death three times for the 1982 rape and murder of 75-year-old Dorothy Edwards, a wealthy Greenwood widow. Elmore had no alibi at the time of the killing. For more, watch "Death Row Stories" on CNN at 9 p.m. ET on Sunday.