Minutes before Gavin Cole was strapped to the execution table, his eight-year-old daughter leaned close and whispered a sentence that made every guard freeze—because less than 24 hours later, that child’s words would stop the execution, reopen a buried case, and force the entire state to face the truth it had almost killed an innocent man to hide.

The woman who was supposed to be dead Warden Robert Mitchell held the photograph like it might burn through his fingers. For five years, Gavin Cole had been scheduled to…