Diane Nguyen Robbins was 13 when she left her home in Kennewick, Washington, on June 18, 1985. She planned to travel to Seattle to visit friends and was seen that day with a 21-year-old friend, Molly A. Purdin; the two were last seen together in King County in the late afternoon. Diane is described as 5 feet 2 inches tall, about 90 pounds, with brown hair, brown eyes and a one-inch scar on her forehead.

Diane’s disappearance was first treated as a runaway case, but concern deepened after Molly Purdin’s body was found off Index-Galena Road in King County in July 1985 and ruled a homicide. A skull recovered near that location was later determined not to be Diane’s. Over the years investigators have pursued leads, including speculation about a possible link to an active serial offender in the Seattle area at the time, and Diane’s case was included in a deck of cold-case playing cards distributed in the state’s prisons and jails to seek tips. The Benton County Sheriff’s Office continues to investigate.

If anyone knew Diane, Molly, or saw them in King County on June 18, 1985, can you share what you remember?