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Their vehicles while off duty. so investigators tried to find some way to narrow it down. and latent evidence expert, ricky navarro, looked for clues on kim medlin's clothing. that's when he noticed a print on her sweatshirt. >> at that point in time, i could not determine whether i was looking at a footwear impression or some other type of object that left that impression on the sweatshirt. >> using alternate light sources and high-speed cameras, navarro concluded he was looking at the heel of a shoe. >> it was a type of shoe that was not flat from toe all the way back to the heel. it had a d...

Of them, since they can use their vehicles while off duty. so investigators tried to find some way to narrow it down. and latent evidence expert, ricky navarro, looked for clues on kim medlin's clothing. that's when he noticed a print on her sweatshirt. >> at that point in time, i could not determine whether i was looking at a footwear impression or some other type of object that left that impression on the sweatshirt. >> using alternate light sources and high-speed cameras, navarro concluded he was looking at the heel of a shoe. >> it was a type of shoe that was not flat from toe all the way ...

Kim's, on the night of the murder. he claimed the woman driving the jeep did nothing wrong, but a police officer turned his lights on and pulled her over. >> he was driving on a revoked driver's license. and so he, of course, was very concerned when he saw the patrol car turn in front of him, so he fell back, obviously not wanting to be too close and draw attention to himself. >> this explained the bruises on kim's wrists, the possibility that they were caused by handcuffs. but police needed to find out the jurisdiction of the police car. >> so we actually used that same witness and we did wha...