UNSOLVED: 2-year-old Arianna Fitts vanishes from San Francisco after her mom is discovered murdered and buried in a city park. Former cold case investigator Paul Holes explores a strange social media post, a mysterious marking on some plywood found with the body and other clues that could lead to Arianna. Maybe YOU can help crack this case.

Tipline: 415-575-4444 or visit The Black and Missing Foundation at BAMFI.org.

Watch: "Real Life Nightmare with Paul Holes" Sunday, Dec. 18, at 9 p.m. ET & PT on the HLN television network.

#missing #PaulHoles #unsolved

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