Disappeared with two others---some say under mysterious circumstances---on July 7, 1979, while flying from Anchorage, Alaska, to Kodiak Island, Alaska. The single-engine, chartered airplane carrying Mackintosh (39), his girlfriend, Susan Insole (29), and British Airways pilot, Graham Barber, took off for an "adventure holiday." Three hours later, Barber sent an S.O.S. saying the plane was losing oil pressure and power. The plane carried no life raft and no life jackets. The coastguard said that "when the plane came down there were 40-foot waves in the gulf and breaking ice." Although an air-sea search was conducted for several days, no wreckage was found and the three were presumed dead.