>> did he say he loved you? >> yes. >> reporter: but rachel was hedging her bets. she told seth she was also interested in a co-worker named brandon who just happened to call her during her tryst with seth in the park. >> he started getting really jealous. >> so on the 20th when you were communicating with brandon, he said what? >> just give me two more weeks. >> did you ask what he meant? >> yes, he just repeated the same statement. >> reporter: six days later, lisa was murdered in her own bed. >> and here we have a motive that we can understand -- love, the whole relationship with rachel was evidence that was like a countdown to lisa techel's death. >> reporter: but defense attorney steve gardner countered, arguing the motive of an affair falls flat without the essential element -- sex. >> seth techel was being accused of murdering his wife for an affair that he was hoping to someday have. >> you never had intercourse with him? >> no.