and he said, "yes." >> reporter: as the investigation continued in durham, police showed shannon crawley's photo to that maintenance man who'd seen a woman driving away from the crime scene on the morning of the murder. and he could not identify shannon as the driver. then they showed him a picture of shannon's burgundy ford explorer. >> he was very positive about the vehicle. he said, "yep, that's the vehicle that i saw." >> reporter: and that wasn't the only thing the witness noticed, >> he remembers a patch or some kinda something, you know, on the shirt. >> reporter: a patch like on the uniform shannon wore as a 911 dispatcher. and there was more: investigators discovered shannon clocked in at about 10am some two hours after denita smith had been murdered. more than enough time for the 55 mile drive from durham to her job at the 911 center in greensboro. so police obtained a search warrant for shannon's house. >> and we do find greensboro communication 911 center uniforms. and they are exactly as described by the maintenance supervisor down to the color of the patch and the shape. >> r