David Robert Gionet, known as Dave, was 18 when he vanished from Interlochen, Michigan, in the early hours of March 7, 1983. He was last seen walking along M-137 near the Interlochen Center for the Arts after leaving a party in Green Lake Township. He was described as between 5 feet 3 inches and 5 feet 5 inches, 125 to 135 pounds, with brown hair below the ears, hazel eyes, scruffy facial hair, prescription glasses, a scar on his left wrist and a tattoo on his abdomen.

Initial searches concentrated on nearby Green Lake after reports that he might have tried to cross partially frozen ice, but dive teams found nothing and that theory lost traction when friends and family said he feared water and was not a swimmer. A green 1969 Pontiac LeMans is listed in connection with the case, but its role is not explained in the available details. No suspect, arrest, or confirmed sighting after the highway has been publicly identified.

The Michigan State Police reopened the investigation in late 2022 and classify him as an endangered missing person. Who in the Interlochen area might remember seeing David or that green 1969 Pontiac LeMans on or around March 7, 1983?