Diane was last seen in Vancouver, Washington on May 29, 1974. She left her residence in the 1800 block of Franklin Street and got into a van driven by an unidentified man. She has never been heard from again. Warren Leslie Forrest, a suspected serial killer, is a person of interest in Diane's disappearance and in the 1971 disappearance of sixteen-year-old Jamie Grisim. He is thought to have raped and killed at least six young women in the Vancouver area. She was 14 years old at the time. Age-progression photo to age 54 on the right.