did tom fallis kill his wife ashley in a fit of violent temper, or what? fallis did not kill his wife and mother of their three children. ashley fallis committed suicide. >> reporter: remember how the prosecution talked of ashey's happy frame of mind? "that ashley was a kind of lie," said the defense. >> ashley fallis was a beautiful woman, but she had a terrible pain inside. she was mentally ill. >> reporter: 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. >> reporter: but even with medications, the friend testifed, ashley had trouble controlling her emotions. >> what kind of mental health issues, uhm, did you observe ashley fallis to be going through? >> depression, mood swings, impulsive behaviors. >> reporter: 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'm sorry to do this to you and