Kim Louise Mallon, 13, was last seen September 30, 1973, while a patient at the UCLA Neuropsychiatric Hospital in Los Angeles. She had brown hair, blue eyes, scars on both wrists, and was wearing a blue knit pullover blouse, white corduroy bell-bottom pants, multicolored oxford shoes, and a silver and turquoise pendant necklace when she vanished.

Authorities believe she may have been using the alias Rhonda Kay Mallon or her birth name, Rhonda Kay Lytton. Her disappearance is classified as endangered missing and is considered suspicious; foul play is suspected. The hospital has since been renamed, and despite decades of investigation no significant leads have emerged.

Anyone who knew Kim, knew her by the other names, or has information about her whereabouts is asked to contact the UCLA Police Department or the National Center for Missing & Exploited Children.