Stephen J. Sullivan was a 28-year-old pilot from Farmingdale, New York, who disappeared on September 23, 1991, when the helicopter he was flying went down in the waters off Block Island, Rhode Island. Wreckage began to surface in the months after the crash; a fishing boat hauled up the helicopter’s tail section in its net, which led the Nassau County Police Department to mount a diving recovery of the remainder of the severely damaged aircraft.

When divers recovered the main body of the helicopter they found the cockpit empty. Investigators were unable to determine the precise cause of the crash, and no trace of Sullivan was ever located. The case remains classified as a missing person under uncertain circumstances, with the empty aircraft the central, unresolved fact.

Did anyone have contact with Stephen in the days before September 23, 1991, or recall seeing a helicopter in trouble that day?