Cynthia Dawn Constantine was 15 when she vanished from Oakdale, New York, on July 11, 1969. She left home to walk her dog along the Montauk Branch railroad tracks and never returned; the dog came back alone with its leash still attached. She was last seen in a white blouse, black Bermuda shorts and orange sneakers, possibly wearing a yellow metal chain with a cross pendant. Physical details: blonde hair, blue eyes, glasses, a mole on her throat, a discolored front tooth and a previously fractured lower right arm.

Three boys reported seeing her walk into the woods near the train station with the dog. Tracks consistent with a girl and a dog were found but were washed away by rain before they could be examined. The community mounted searches and dragged a nearby lake without locating her. Investigators later considered several local people and briefly examined unrelated remains found in 1978, but no public charges or identifications followed. Her brother remains hopeful for answers.

If anyone remembers Cynthia, her movements that day, or the area around the Montauk Branch and station in July 1969, please share what you know.