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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 were 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 businesse...

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...

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 didnt. but gil did. he drove a white nissan pathfinder. i me...

>> 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 prosecutions star witness, the forensic video analyst who placed gilbertos s-u-v at the scene, the defense said his findings proved nothing. >> even the expert doesnt say, "oh yes, i see in -- in the video surveillance it was tom kolman with gilberto in the car." no, he didnt even see if someone went from one car to the other car. >> the de...

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 were 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 gils white s-u-v -- which he sold a few weeks after toms 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...

That is in my office or anything like that. i have nothing to do with whatever was in toms system. i had nothing to do with any of that. >> did you give him a polygraph, as well? >> we offered. >> did he take it? >> no. the next day after that interview, we were contacted by a lawyer stating that thered be no further contact with his client. >> meanwhile, linda was reeling from all that police had told her. from the images of the white suv in the video, to the drug in her husbands system that a ...

These lights were not providing any illumination at all. the only thing we could observe was that the two vehicles were parked side by side for about 30-35 minutes. >> the mystery suv left around 5: 30am. but toms car never moved. >> what does that tell you? >> there had to be contact between the two to meet at this point, at that hour. so we knew now that someone had met with him prior to his death. and we now have to figure out who that is. >> easier said than done, of course. >> we just pulle...

This could be medical or are you starting to think, "we could have a homicide on our hands"? >> you can think both at that point in time because weve had to wait for toxicology reports to come back to -- to come up with a cause of death. but in the meantime, were -- were thinking -- i would say thinking the worst. >> until we can disprove that its not a homicide, weve got to treat it as such. >> crime scene techs worked on toms car and took swabs for clues. while detectives set out to learn more...

See thomas kolmans vehicle pull into the parking lot and park right next to this white suv. >> thats when we knew that obviously someone else was there with him that morning. >> the plot really thickened, im sure, after seeing that video. >> yes. >> so this is the planet fitness right here? >> this is planet fitness to your right. this is -- >> where -- >> -- tom worked out every morning. >> ill pull into toms spot. >> bill weishaupt is a retired f-b-i agent and the chief investigator for the ul...

>> did you, kind of, think that this was going to be an open and shut case once you got the autopsy results? >> yeah. absolutely. and -- and that unfortunately was not -- not the outcome the next day. >> instead, the results would turn this tragedy into a tangled mystery. coming up -- what had happened to tom? >> 40-year-old men dont drop dead like that. >> we just couldnt believe it. >> why didnt you believe it? he was always in good shape. exercised and everything. >> if theres a death thats n...