that bit of dna on a shell casing recovered from the scene of steve pitt's murder.can take weeks or months. that was time police didn't have. >> we had some family members of mr. jones that were in northern arizona. with the help of the phoenix police department air unit we flew a detective up there. >> at the same time, other investigators were on the hunt for dwight. >> we had a vehicle description for mr. jones. it was a 2001 gold mercedes e320. >> cops started pulling security video from the multiple crime scenes, looking for that gold mercedes. >> some surveillance video near the scene of dr. pitt's office picked up that vehicle sort of acting strangely in and around the time of the shooting. >> and pictures from the following day showed what looked like the same car near the law firm just minutes before the two paralegals were murdered. it had been 14 hours since rick anglin tipped off investigators to dwight. as the investigation continued, police found evidence dwight and his gold mercedes were in a suburb called found hills, just 30 minutes outside scottsda