reporter: the family insists bonnie told frances about the affair because she was angry over, of all things, a manicure. she was upset because my father wouldn t give her $100 to get her nails done. reporter: they said bill told them that bonnie had been stalking their whole family on facebook. she had created a fake account with a fake profile picture and friend requested the entire family. everyone accepted. my mom had her, i had her. aunts, uncles, cousins. reporter: the family said bill told them that s how bonnie gathered information, that she would use to manipulate him. if we went on a trip as a family or if he took my mother to las vegas, immediately after, he would have to take her somewhere. reporter: according to frances and nikki, bill said he wanted to break up with bonnie, but she threatened to air their affair all over the internet. he goes, i can t get rid of this person. she had over 2,000 pictures. in my 34 years of knowing bill, i don t have that many
it was her sending those text messages. bill wouldn t have never disrespected me like that. reporter: but if there was any doubt that she d been following the halls, she seemed to confirm it herself by sending photos of their house and frances car. why were you sending those pictures? to piss her off. to defend myself. reporter: what are you i mean, you re the one but, but her telling me that bill didn t love me. her telling me that bill was using me. reporter: but bonnie, you re the one who is having the affair with bill. so why are you attacking his wife? because she was attacking me. and i will defend myself. reporter: one week after that text message feud came the car chase that left bill hall dead. nearly three years after that frances hall went on trial for murder. prosecutors stephanie paulissen and scott simpson laid out the case for the jury. we understand why she was angry. but that s not justification to go attempt to run down your husband s mistress a
and i kicked him. and he goes, stop already. i go no. reporter: she went after his prized possessions, nothinging over his custom harley-davidson and hitting their new range rover with a stick. he pushed me down. i fell down. and he took off and waved at me. smiling. reporter: the following day was rough for frances. her family coaxed her out of the house to watch her niece s volleyball game. then, on her way home, driving her cadillac escalade i see bill, in back of bill, i see the range rover. and i m like, who is that? reporter: the vehicles were coming toward her in the opposite lane. and as they passed, frances did a double take. sitting behind the wheel of her family s brand-new range rover was bill s mistress, bonnie contreras. frances said they locked eyes for the first time. and, of course, i get her little finger. reporter: like the middle finger? right. and i keep going. reporter: furious, she called her daughter nikki. she said i m turning around, i m
and i took his word. i never again bothered him about it. reporter: he affectionately called her his gorda, his chubby lady. and during their three years together bill lavished bonnie with attention. spa days, vacations. bonnie, come and feel the dolphin. reporter: and even breast implants. i wasn t that big. i was maybe a small b. and he goes, go do them. we ll pay for them. reporter: and then she says, a 5 carat diamond ring. it meant love, it meant friendship. it meant a future together. reporter: bonnie denies calling frances out of the blue. she says frances had known about the relationship for years and that the two women even spoke by phone about the financial arrangements of a divorce. who was going to keep what. and she was just going on and on about the properties and about money, about the company. and i said, i m not even asking for none of that stuff.
reporter: bonnie was a 28-year-old single mom when they met. about 20 years younger than bill and frances. she said their love affair bloomed in the most unlikely of places. i met him at a spinach festival. reporter: spinach? spinach festival. i was helping my aunt sell chicken on a stick. i know it sounds kind of corny, but that s how i met him. reporter: bill happened to stroll by that chicken stand with some friends. as soon as i saw bill, we kind of just locked eyes. reporter: bonnie was intrigued enough by this handsome older gentleman to sneak a peek at his ring finger. no wedding ring. no mark. you know, i figured, he s single. reporter: according to bonnie, the two started to spend nearly every day together. i fell in love with him. i didn t expect it. it s not something that i was looking for at all. reporter: bonnie said bill told her he was separated from his wife and going through a divorce.