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>> my job was to see if there was any relation between the tires that were photographed of the moving vehicle and what was left at the scene. i was able to document that six different tires that had two different types of tire tread impressions, two different sets of class characteristics, were represented very neatly on the scene. >> this meant it was virtually certain tracey's moving van left these tire tracks. but one question remained. >> how does a woman tracey's size move a guy that large? >> the answer? a hand truck came with the moving vehicle. >> she merely has to place the hand truck...

He was 25-year-old kent embry, who had prior arrests for petit theft and burglary. >> a suspect happened to be wearing spalding tennis shoes like we had told the investigators that they were looking for. >> since these are spaldings and we already know that we need spaldings, we needed to have these analyzed right away because this could be the big break in audrey's shooting. >> police sent the shoes to the forensics lab, where they were inked and printed. using transparent overlays, amy michaud compared them to the two partial prints found in audrey nichols' home. >> that was compared directl...

Amount of grooves and twists. there were six grooves and were a compatible width so the -- we call those class characteristics because it is possible for other guns to have six grooves with a twist of a similar width. it does help narrow it down. for instance if these had five grooves and my gun had six grooves then i could automatically eliminate it. the class characteristics of the bullets and jacket match. however, i was not able to, again, i could not identify it as being fired in that gun or eliminate it as being fired in that gun. >> let me ask you to assume the following fact for the pu...

>> in the yard, investigators found the projectile that passed through shaw's body. this along with the two inside shaw's body were sent to the forensics lab. under a microscope, firearms expert chris henderson discovered that the lands and grooves on two bullets were the same. the third bullet was different. >> we determined that we had two different shooters based on the class characteristics of the bullets. >> in their search for potential suspects, police had to consider whether rosana shaw had anything to do with her husband's murder. ron's grown son from his first marriage certainly thou...