The 18-year-old ex-wife was one of two women in a car driven by a 30-year-old man.
Police say, at around 7:30 Thursday evening, that car was rammed from behind near Kellogg and Hillside by a pickup driven by the woman's ex-husband.
The woman warned the driver not to stop. But, the pickup pulled in front of the car, slowed down and forced the driver to stop.
They pulled over on Kellogg near Oliver and the driver got out to check the damage to his car, when the other man put his pickup in reverse and rammed the front of the car. He then drove off.
Police know who the man is and they are looking for him.