then, at last, it was time for the state's star witness, rachel mcfarland -- the other woman -- to showke her? >> we needed the jury to believe her. >> reporter: rachel testified her relationship with seth started heating up in december, 2011, which was two months after seth got married. >> it became more sexual, asking me to send pictures. or, i don't know just showing off my body i guess. >> reporter: on may 20th, 2012, seth and rachel met at a nature preserve, where they took this selfie to remember their time together. >> i mean he kissed me, touched me. he said that we had everything in common and that he had tried working things out with lisa and things weren't working and i was exactly what he wanted. >> reporter: she said seth repeatedly told her he was going to divorce his wife. >> 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 just started getting really jealous. >> and so on the 20th when he learned tha