He was the double glazing salesman turned killer. What made Kevin Cotterell's crime even more shocking and scary was that he murdered Connie and Janice Sheridan in their own, quiet, Fenland home - they knew and trusted him so they let the killer in. The deaths shocked the world of dog breeding where the Sheridans were popular and hardworking animal lovers, and Norfolk police launched its biggest ever manhunt in the search for the killer who came calling
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Ready to Watch Real Crime, Season 2, Episode 6?