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In 2006, a stranger leaves a beheaded body outside a Delhi jail with a note challenging the police to catch him. It isn't his first — or last — murder.

During interrogations, Chandrakant shares his fraught history with the police. Investigators face a challenging search for conclusive evidence.

Ghosai residents offer powerful accounts and photos from Chandrakant's past. Experts discuss the case's mental health and social implications.