William David Henderson, 55, was last seen in San Francisco on September 11, 2003. He was described that day wearing a gray jacket, white shirt, black pants and black shoes. Henderson had white hair, hazel eyes, a scar on the back of his head from a hair transplant and needed prescription eyeglasses with black rims. He may have gone by his middle name, David, and was a dependent adult, which heightened concern when he vanished.

The morning after he was last seen, his car was located abandoned near the beach in Pacifica, a short distance from San Francisco. Few additional clues have emerged and the case remains open and unsolved. The San Francisco Police Department is asking anyone with information to come forward.

If anyone knew William’s routines, places he frequented, or saw him around September 11–12, 2003, please contact investigators with information.