Sent to his first mental institution at the age of 17, Fritz Haarmann had a troubled childhood full of trauma. He went on to murder close to 30 people between 1918 and 1924. His massive killing spree left a lasting legacy on both his hometown and the entire country of Germany.
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Proven Innocent - Proven Innocent Premieres Friday, February 15th at 9/8c, only on Fox.
