>> police gathered additional video from nearby businesses to get a better look at the white suv. grant then poured through a database of 18,000 vehicles that is used by the fbi. >> each manufacturer has a unique way of differentiating their vehicles. the length of the vehicle might be a bit longer, the shape of the windows will be slightly different from manufacturer to manufacturer. >> frederick's testified that gills car was a closest match as he could find to the one of the security political. a 2010, nissan pathfinder. and he told the jury one more important detail. the suv in the vehicle had a fog light defect. when that cast a distinct headlight pattern. >> what we're seeing from this vehicle is that it has this white light that is on the ground that moves in front of the vehicle. >> detective tracked down gills white suv which he sold a few weeks after tom's death. and drove it along the same route scene in the security