Onizuka (Ellison) Colour Nasa photograph of Ellison Onizuka, signed in black ink, mounted, overall size 35 x 51 cm.  ***Ellison Shoji Onizuka was an American astronaut and engineer who successfully flew into space with the Space Shuttle Discovery on STS-51-C. He died in the destruction of the Space Shuttle Challenger, on which he was serving as Mission Specialist for mission STS-51-L.