. >> in 25 years on the job, detective murphy had never heard a story quite like this. he pressed further, he said, pushing elizabethn how her mother talked her into murder. and the answer, elizabeth says now, was this -- it was love given and withheld. >> it wasn't really an affectionate home overall at all. i wanted, like, a real mother/daughter relationship, and it just never was there. >> several months prior to the murder itself, her mom was taking her shopping, they were going out, they were actually being a family. there was some type of parental involvement. >> she liked that a lot. >> she liked it because that was something that she was lacking. >> but finally having offered her daughter the maternal affection she so craved, joan threatened to withdraw it unless she got that gun and used it to kill her father. or so elizabeth claimed. >> its sounds crazy at first, 6 but when somebody is in your ear, let alone your mother, every day, it got to the point where it was, like, normal. i just want to do this to please her. i just want to do this so nothing changes between me and her. >> and so elizabeth said on t