Kathleen was last seen at her Riverton, Wyoming home on April 17, 1989. She disappeared while her fourteen-year-old, Kelly Pehringer, was at school. She took her purse and glasses with her, but her vehicle was left behind, parked out in front of the house. When Kelly came home from school, her mother was gone and there was no note to explain her absence and say when she would be expected back, which was uncharacteristic of her behavior. She has never been heard from again. Authorities believe Kathleen left her residence willingly with someone she knew and intended to be gone for only a short time. Authorities believe Kathleen was the victim of a homicide. Her case remains unsolved.