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Nearly 35 years after Jonelle Matthews' disappearance, a chilling discovery reignites the hunt for her killer, whose secrets are finally unmasked; an unlikely hero comes forward and a historic trial forces a reckoning.

The Girl on the Milk Carton

A Monster Revealed

Days before Christmas 1984, 12-year-old Jonelle Matthews vanishes from her home; as shock grips Greeley, Co. local detectives turn to the FBI, President Reagan and a national milk carton campaign for answers.

A Devastating Disappearance

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The story of Jonelle Mathews, the first missing child given the tragic distinction of appearing on a milk carton.

S1 E2 | A Monster Revealed