Robert Donald Linton, 62, and his wife Dagmar left the Naco West Campground in Brinnon, Washington, on August 22, 1986, in their gray and white 1982 Dodge Ram 1500 pickup for a day trip to Mount Baker. They never returned to their travel trailer and were reported missing that same day. Their pickup was found abandoned that evening in a parking lot at Seattle-Tacoma International Airport; forensic testing of the vehicle recovered blood and hair, and investigators treated the case as a presumed homicide.

Investigators later linked Charles Thurman Sinclair to the Lintons through handwriting that matched signatures on credit card receipts for purchases made with the couple’s cards after their disappearance, and some items bought with the cards were recovered from a storage shed belonging to Sinclair. Sinclair was arrested in Alaska in August 1990 on unrelated charges and died in October 1990; he was never charged in the Lintons’ case. The Lintons’ bodies have never been recovered and the case remains unsolved.

Did anyone in the Brinnon or Mount Baker area at the time notice the Lintons’ truck or see the couple on August 22, 1986?