"Stanley David Griggs (September 7, 1939 \u2013 June 17, 1989) was a United States Navy officer and a NASA astronaut. He is credited with conducting the first unscheduled extra-vehicular activity of the space program during Space Shuttle mission STS-51-D. Griggs was killed when the vintage World War II training aircraft he was piloting crashed near Earle, Arkansas."@en . "Griggs, S. David"@en . . . . "1939-09-07Z"^^ . "1989-06-17Z"^^ . . "David Griggs"@en . . . . "1939Z"^^ . "United States admiral" . "604500.0"^^ . "1989Z"^^ . "Deceased" . .