20 Terrifying Killers You’ve Never Heard Of

#20 Mary Bell

Photo: YouTube

At just 10 years old, Bell committed her first murder. She confessed to killing a four-year-old by strangling him with her own hands.

She later recruited a friend to join in on her crimes when she murdered a three-year-old boy. The second murder was more violent, and she left behind more evidence.

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Terrifying Killers — Sources

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