ecales was convinced he was closing in on susan schumake's killer but only dna could fruv a prove it and the suspect wasn't willing to provide it. so michigan state police decided they would take it in a completely legal manner. >> they decided to have surveillance on him. so we could identify him or eliminate him. >> it wasn't easy since he worked in an autoparts salvage yard, only other employees could get close to him without rousing suspicion. then police learned that he recently sold his car and they knew he smoked cigarettes, so they traced the car to the new owner. >> they asked about cigarette buts in the ash tray and he said