internet search for the word "midazolam." >> if thomas kolman had been sleeping -- >> reporter: the prosecutor suggested that gil, as a medical professional, figured out that tom's sleep apnea combined with the sedative could be a fatal combination. >> walk through your theory of what happened the morning of tom's death. >> the night before, i believe, gil and tom had texted about meeting that morning. i think, at that point in time, gil wanted to meet up with tom because of the fact that he knew that he wasn't gettin' linda. gil got out of his vehicle and entered tom's vehicle. at that point, maybe he brought him a coffee. i mean, it's early in the morning. here -- "hey, bro. i brought you a coffee. we gotta talk." and a short time later, gil was driving away and tom was dead. >> reporter: but prosecutors faced a couple of obstacles. for one, the judge wouldn't let them use parts of gil's interview with the police because he had not been read his rights, so jurors never saw how gil initially denied to police he'd ever heard of midazolam.