Shannon Elizabeth Rishel, 25, was last seen on July 9, 1995, near Rufus in Sherman County, Oregon. The night before, she and her boyfriend were driving her white Chevrolet Camaro when it became high-centered and stuck on a dirt road between Rufus and Biggs. The boyfriend told authorities they had been using drugs, said he fell asleep in the stranded car, and reported that when he woke the next morning Shannon was gone.

Investigators found Shannon’s purse, identification, cigarettes and the clothes she had reportedly been wearing inside the disabled Camaro; a yellow blanket that had been in the vehicle was missing. She had a change of clothes with her and is presumed to have been wearing them, possibly after a rainstorm. Search dogs tracked her scent about two miles from the car to a truck stop in Biggs, and a witness later reported seeing a woman matching her description get into a semi at a Biggs market between 5:00 and 6:00 a.m. on the morning she disappeared. An extensive search including air and dive teams turned up nothing.

Shannon was the mother of two toddlers, had recently separated from her husband, and worked at a restaurant in Redmond. Her family and friends say abandoning her children would have been out of character. Did anyone see Shannon that morning or remember a semi leaving Biggs around 5:00 to 6:00 a.m.?