As the legal legwork continues, pushing for the exhumation of Stephen Smith's body, crime screen photos raise important questions about the original investigation. Why was there mud caked on the teen's shoes? Why was his car's gas cap askew? If Stephen Smith was hit by a car, why wasn't there more blood at the scene?   Nancy Grace talks in-depth with Chris McDonough. He's the Director at the Cold Case Foundation,a former homicide detective, and host of YouTube channel,  'The Interview Room.’