>> the star witness for the prosecution, bonnie contreras. >> i start to get hit from behind. >> bonnie told the jury how she watched with horror as she believed frances deliberately knocked bill off the road. >> i see her hit bill with the truck. and i see him fly off the motorcycle. >> bonnie said she later discovered frances'daughter, nikki hall, had left a message on her voice mail during the car chase. a message that seemed to speak to frances'intent that evening. >> told you to watch your back you [bleep] stupid [ bleep ]. >> what does that tell you? that they were out to cause harm to somebody. >> this is not an accident. >> tim lovett was the state's collision reconstruction expert. he said the evidence showed frances chased and hit bonnie. >> that escalade definitely hit that range rover at least two, maybe three times. >> but frances'defense attorneys, leigh cutter and jean brown, said investigators