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>> midazolam? >> midazolam? >> and prosecutors still had to link gil to the crime scene. they wanted to prove the suspect suv seen at the planet fitness parking lot, belonged to gil. >> so we're able to track the movements of this vehicle through this gauntlet of cameras. >> grant fredericks is a forensic video analyst and was the key to making that connection. >> and we can begin to make observations of the vehicle itself and the pattern. >> police gathered additional video from nearby businesses to get a better look at the white suv. grant then pored through a database of 18,000 vehicles tha...

She might have had access to hell would i ever want harm done midazolam. >> we made sure all the midazolam that they had was accounted for during that time period. >> they also asked her to take a polygraph test. she took a polygraph? >> yes, she did. >> pass? fail? >> passed. so she was ruled out, in -- in our eyes. >> that left one person policed needed to talk to again, her former lover, gil. and this time, they planned to confront him with all their suspicions. so they decided it was time to bring gil in for another talk. >> it lasted approximately seven hours. >> that's a long time. >> it...

Nunez? what was going on between the two of them that they would all -- that tom kolman would allow the sexual relationship to continue between his wife and nunez? >> did you have to think of the scenario that maybe linda wanted tom out of the way so she could be with gilberto? >> no question. that was top on the priority list. >> and the first question for investigators -- did linda or gil drive a white suv? detectives knew that linda didn't. but gil did. he drove a white nissan pathfinder. i mean, there are a million white suvs out there. >> sure. >> once you think about it and you start loo...

>> not a search for a question about the drug. not how to kill with midazolam. a search that led to a wikipedia page. that search says nothing. >> as for the prosecution's star witness, the forensic video analyst who placed gilberto's s-u-v at the scene, the defense said his findings proved nothing. >> even the expert doesn't say, "oh yes, i see in -- in the video surveillance it was tom kolman with gilberto in the car." no, he didn't even see if someone went from one car to the other car. >> the defense raised another possibility about who was in the white s-u-v. they reminded jurors, tom was...

And he told the jury, one more important detail. the s-u-v in the video had a fog light defect, one 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. >> detectives tracked down gil's white s-u-v -- which he sold a few weeks after tom's death and drove it along the same route seen in the security footage. >> sure enough, when we went out to the scene and did our tests, we turned the lights on and there was the pattern that was quite visible. >> gil's car had the same defect vis...