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 and kill him in the process. >> reporter: the star witness for the prosecution, bonnie contreras. >> i start to get hit from behind. >> reporter: bonnie told the