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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...

And i'm, like, "i wasn't. you did this. get away from me." >> he was saying that the police were saying you were involved? >> and i was, like, "okay." you know, "liar, " and he was, like, "i didn't, i didn't." >> but while both linda and the police were convinced gil was behind tom's death, investigators had no solid evidence. that grainy video didn't conclusively put him at the scene and they couldn't prove the sedative found in tom's system came from gil's office. the district attorney told his chief investigator they didn't have a case. >> we didn't have the evidence that i felt or that my ...

Something liquid in his stomach that might have been coffee. >> we have a friend of the victim, having an affair with the wife, drives the same type of vehicle like on the video next to our victim on the day of the murder. >> this is now a murder investigation? >> 100%. >> they called linda down for more questions. >> they asked if i knew what drugs were in tom's system. they asked me about the relationship with gill. >> they asked me what i knew about that morning. >> they also decided to tell her about their suspicions, that her husband was murdered and gil was their prime suspect. >> i foun...

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...