he didn't want her to add marijuana to this toxic system that was developing inside of ashley fallis.ley and tom quarrelled that night, but insisted it never got physical. those scratches on tom's chest? the ones the prosecutors believed were proof of a struggle? dna tests never found any evidence to support that. >> you did not find any of ashley fallis' dna, cellular material on the swabs from tom's chest correct? >> that is correct. >> reporter: the defense reminded jurors that tom told police why he had the scratches, that he'd done a little "manscaping" to spice up his marriage. he had texts and photos to prove it. >> there's tom fallis when he has hair on his chest, all the way to the left, and on december 17th, 2011, he texted ashley, "there you have it. you get your way, so here it is. thought you might like it." >> reporter: so the scratches, said the defense were because it was itchy. and that's all. as for the so-called witnesses, said the defense, totally unreliable. the one changed her story on the stand, and the other? well, just months after the shooting, young nick glo

"that ashley was a kind of lie," said the defense. >> ashley fallis was a beautiful woman, but she hade. 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, >> 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 the kids, but i find myself not even liking my children." >> reporter: "every day is a chore with them and you. i have to pretend to be happy. i have to pretend to be someone i am not. please make sure you raise the kids to continue to go the school we have chosen. i do love them. i just can't take this life any longer. pl