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Hosted by “Dateline‘s” Andrea Canning, “Dateline: The Smoking Gun” is a hunt for clues as detectives relentlessly pursue the critical piece of evidence that ultimately cracks the case. Each investigation is packed with twists – false leads, wrong suspects, dead ends – until police finally uncover the smoking gun and arrive at justice. Stories investigated this season include a disappearance involving a young film director, two prosecutors killed in a small Texas town, and a serial killer who must be stopped before the next victim is murdered.