Tonya Kay Teske was 18 when her body was found on August 15, 1997, on a grassy ramp off U.S. Highway 20 near Ucon, Idaho. She had been hitchhiking across the Mountain West after dropping out of high school in Shoshoni, Wyoming, and was last seen two days earlier at a truck stop in Gallatin County, Montana. A truck driver and his wife discovered her naked body.

The unidentified woman remained a Jane Doe for ten days until a sketch circulated at truck stops led to her identification. The autopsy showed no obvious wounds and toxicology was inconclusive, but investigators found evidence of sexual assault and treated the case as a homicide because of the circumstances. No arrests have ever been made.

In October 1997 police named an unnamed Idaho-based truck driver as a possible suspect after evidence possibly linking him to Teske was found in Island Park, but that lead did not produce charges. Theories about what happened include homicide by a truck driver, involvement of a regional serial offender, or an accidental death followed by body disposal; the exact cause remains undetermined.

Did anyone who knew Tonya or who worked the highways and truck stops in August 1997 see her or the vehicle she was with?