vanessa's husband travis mcgraw. >> travis mcgraw had a lot of secrets he was not wanting to share.vis was secretly seeing. >> you gave travis an ultimatum. you told him to choose. the next day vanessa is murdered. did you think that was just a coincidence? >> it's so weird to say in my mind. i thought it was a coincidence. >> this was money and sex-driven and how disgusting is that to murder someone for. >> she thought that was a coincidence. i'm biting my teeth into powder. >> she's in denial. it's such a tragedy. this is such a wonderful, wonderful family who opened their hearts up to us. it's such a sad story. >> how did they find out about the secret life? >> well, the investigators always look at the immediate family. they check out your credit cards and cell phones. and on travis's phone there was a romantic text and it wasn't his wife. they immediately had a link to mary beth fisher. >> so was his relationship with mary beth a motive for the killing? >> i think it might have been. there was a life insurance policy. he put in claim. he wanted a new life but this ultimate item