Sandra Kaye Butler was last seen in Sparks, Nevada on June 26, 1978. She was walking to the Greenbrae Shopping Center, across the street from her family's apartment at Fourth and Greenbrae Streets. She has never been heard from again. At the time of her disappearance, she was considered a runaway and authorities did little to find her. It's possible that Sandra was a victim of the serial killer couple Charlene and Gerald Gallego, who were ultimately convicted of the kidnapping and murders of several teenage girls in California, Oregon and Nevada.