One man testified in 37 cases. His fellow inmate landed on death row.

Pamela Colloff is a staff writer at New York Times Magazine, a reporter at ProPublica and the author of “Catch the Devil: A True Story of Murder, Deception, and Injustice on the Gulf Coast.” For most of his adult life, Paul Skalnik, a former police officer, pretended to be someone he was not. He po...

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