you land an interview with meredith chapman. >> i did. >> 15 years younger than you?was. >> what was that initial meeting like? >> i was actually very concerned. i was concerned about me reporting to someone who was so much younger, who had so much less experience. when i sat across the desk from her witoork for this . she was so articulate and so an the position that she was in. and i was dumbfounded. >> and then you get the offer. >> i did. >> he was excited about that job. it was a good job. he was also excited i think to move to that area of the country. this was some place. he was kind of moving up, if you will. >> one of the last memories of august 2017 was sharing that once in a lifetime view of the solar eclipse. >> oh my god! >> in that moment, in the eclipse, in the darkness, were you happy? >> i think we were our version of happy. i had my arm around her and we were just basking in the moment. 60 days later it all came crashing down. >> bloodshed in pennsylvania. a gruesome discovery. residents are still re-living ♪ managingaudrey's on it.s? eating right an

meredith chapman, who was 15 years younger than him. >> she was so articulate and accomplished to be in the position she was in. i was dumb founded. >> reporter: mark ultimately got the job and moved to delaware. >> jennair stayed back to lease our home and so i moved ahead 45 days. >> in those first few days and weeks where jennair was still back in south carolina how would you describe life on the job with meredith? >> it was jaw-dropping to see her command a room. >> reporter: she had an impressive resume at the age of 32. >> she had ran for state senate in delaware. >> today i am announcing my candidacy for the delaware state senate for district eight. >> and had been named to delaware's 40 under 40 for young achievers. >> and eventually, finally she said i think after the first two weeks, she said, "let's have a drink." >> when you went for drinks with meredith you poured your heart out to her. >> i did. i don't know why, but it was so easy to talk to her. >> i didn't know it was happening. and i was confused by the feelings i was having, to be honest until i think i it became j

. >> reporter: 33-year-old university executive meredith chapman found dead killed by the wife of a mane. happy new year! >> reporter: new year's eve 2017, 47-year-old jennair geradot just moved to delaware to join her husband of 24 years, who started a job at the university of delaware. mark developed a secret heated romance with his boss, meredith chapman, a married woman who was 15 years his junior. mark spoke exclusively to me in his first television interview. >> i just wasn't myself. and jennair picked up on it and ask what had is up. i didn't want to talk about it. i didn't know where i was with it. she said it's meredith, isn't it. we talked about meredith before in the context of her professional decorum. it wasn't too far of a leap for her to get there. and i denied it. >> reporter: but jennair digs deeper, keeping close tabs on mark, quizzing him about meredith and asking him about comings and goings and seems to have information she couldn't have any way of knowing and can't figure out how. unbeknownst to mark his conversations with meredith are being recorded by jennair. >>