. "Sgt. John Shelton was the first member of the Durham Police Department to encounter Crystal Gail Mangum on the morning of March 14, 2006. Shelton responded to a 911 call placed by Kim Roberts at 1:22 am."@en . . "John Shelton"@en . . "Sgt. John Shelton was the first member of the Durham Police Department to encounter Crystal Gail Mangum on the morning of March 14, 2006. Shelton responded to a 911 call placed by Kim Roberts at 1:22 am."@en . .