chris was having an affair with a young, pretty brunette, nicole kessinger. she says chris told her he was separate asked was working on a divorce. >> we got along very well. what we ha it s comfortable for me. i enjoyed it, i think he did as well. >> these are photos of their time together. >> he didn't have a wedding ring, he didn't mention his kids. one day he told me he had two kids. i thought it was kind of cute, oh, he's a dad. >> reporter: all these photos, including nude pictures, would end up in a secret app camouflaged as a calculator in chris' phone. >> my daughter, she had no clue. she was clueless. >>> when we come back, nicole'sy missing, she's 15 weeks pregnant. >> i just realized that he was lying to me and i was like, well, if you can lie to me about this, what else are you lying to me about? forget about vacuuming for weeks. the (new) roomba i7+ with clean base automatic dirt disposal so dirt is off your hands. if it's not from irobot, it's not a roomba. ...that's why i've got the power of 1-2-3 medicines with trelegy. the only fda-approved

. >> kessinger is a co-worker in chris' office. and he tells nicoles separated and that they are working on getting a divorce. >> reporter: these are photos released by authorities of their ogmer. >>et he didn't have a wedding rg on his finger. he didn't even mention his kids right away either. and then one day he told me that he had two kids. i thought it was kind of cute. i was like, "oh, he's a dad." >> the relationship between chris and his co-worker/mistress, heats up pretty quickly. kessinger describes it as being very passionate, that they were having sex three, four times a day in the beginning. >> reporter: chris appears to be falling hard for nichol, searching on google, "when to say i love you for the first time in a new relationship." >> so, did he ever tell you that he loved you? >> yes, he did. >> did you ever tell him the same? >> a couple times. >> by all accounts and by all descriptions, it sounds like they were beginning a dating and intimate relationship. >> reporter: a blossoming romance with love letters and all. >> have you readh