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"An Unexpected Killer" returns to Oxygen with all new episodes, including one about the 1979 murder of Savannah Anderson.

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About An Unexpected Killer

An Unexpected Killer takes a wild and unpredictable journey into homicide investigations where the true identity of the killer comes as a shocking surprise. Combining unparalleled access, captivating interviews and stylish reenactments, each investigation starts in a familiar way - examining the crime scene, interviewing potential suspects… but then something unexpected changes everything. A new witness, an overlooked piece of evidence or even an innovation in forensic science sends investigators on a totally unexpected path that ultimately leads to the conviction of the real killer.