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New details have been released in the decades-old clown killing case. Last fall, Sheila Keen Warren was arrested and charged in the death of Marlene Warren. She has pleaded not guilty to the crime. Investigators say Keen-Warren dressed in a clown costume and shot Marlene on her doorstep in Florida back in 1990. Among the hundreds of pages of new information made public, DNA tests done by the FBI say hair found in a car linked to the murder may have come from Keen-Warren.