Isaiah McCoy walked out of a Delaware prison a free man in January 2017, five years after being convicted of murder and sentenced to death. A judge found him not guilty at a retrial, and McCoy soon began enjoying the limelight that came with his exoneration. He reveled in speaking engagements before lawyers associations and anti-death penalty groups. “People were loving my story,” McCoy said. But in less than a year, he went from death row in Delaware to giving speeches about wrongful convictions to back behind bars. Now, he’s in a detention center in Hawaii, where he is charged...