Boyd was last seen in Rupert, Idaho on December 20, 1988. She called her father on the phone that day and sounded upset. He went to her apartment and found the door ajar, Christmas music playing, and Boyd missing. Her purse and Christmas presents for her children were on the table. It appeared she had been interrupted while wrapping the gifts.

Hikers found Boyd's gray Ford sedan at the base of the Twin Sisters formation in the City of Rocks in March 1989. It looked as if the vehicle had been there for a long time. The driver's side door was unlocked and cigarettes, Boyd's belt and her broken sunglasses were on the ground nearby. Inside the car, police found nine empty cans of Coors Light beer, an empty bottle of Nytol sleeping pills, and a makeup case containing cross-tops, a type of amphetamine. No further examination was made. The car was towed and given back to the bank that held its title.

Boyd left behind three sons. At the time of her disappearance, she lived in and managed apartments at the corner of Ninth and A Streets, and worked the night shift at Magic Valley Foods. Her case remains unsolved.