Dateline NBCWhen film executive Gavin Smith vanishes, Los Angeles detectives search for clues amid reported sightings and suspicious circumstances.
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Dateline NBCWhen film executive Gavin Smith vanishes, Los Angeles detectives search for clues amid reported sightings and suspicious circumstances.0Dateline NBCErik and Lyle Menendez were convicted of murdering their own parents more than two decades ago; now hear chilling new details about the gruesome double slaying from the brothers themselves.