did tom fallis kill his wife ashley in a fit of violent temper or what? how the prosecution talked of ashley's happy frame of mind? that friend was a kind of lies, said the defense. >> ashley fallis was a beautiful woman but she had a terrible pain inside. she was mentally ill. >> the defense put one of ashley's close friends on the stand. >> what did you know of ashley having a mental illness? >> i knew that she was on medications. we spoke pretty in-depth about that. >> but even with the medications, the friend testified, ashley had trouble controlling her emotions. >> what kind of mental health issues did you observe ashley fallis to be going through? >> depression, mood swings, impulsive behaviors. >> in fact, the defense argued ashley was so depressed the summer before she died she wrote this letter to tom. >> i have so much pain on the inside i can no longer take it. i am sorry to do this to you and the kids but i find myself not even liking my children. >> every day is a chore with them and you. i have to pretend to be happy. i have to pretend to be

ashley's family, can they just accept this and go on? >> i don't think they will ever accepted. to say that they were distraught would be an understatement. they, i, think truly believe that tom fallis killed their daughter and they are never going to let that go. >> an idea once so deeply engraved, sure enough will not go away. and tom fallis and his children make a life as best they can. >> that's all for this edition of dateline. i'm craig melvin. thank you for watching. ng ng she mainly comes in dreams, and it's so real, it feels like her. and she just gave me a hug. she mainly comes and dreams. and it's so real, it feels like her. and she just gives me a hug. why did it have to happen to our family? >> why did it have to happen to michelle? why that they? >> a young nursing student disappears. she was still dressed in my hospital scrubs. something drew her out to her car. >> the cousin she grew up with. the brother she raised. desperate to find her. >> they were able to do what a lot of other families have never been able to do. >> text messages, security monitors, surveillance vi