Fallen Astronauts Memorial
03.23.1961  TRAINING  While training in a low-pressure chamber, Valentin Bondarenko dropped an alcohol-soaked cloth onto an electric surface. Fire engulfed the pure oxygen environment, and Bondarenko died of burns in the hospital.
10.31.1964  TRAINING  Theodore Freeman was killed when a bird struck his supersonic T-38 jet trainer, causing an engine flame-out.  Freeman ejected from the craft, but was too low to the ground for his parachute to open. 
02.28.1966  TRAINING  Original Gemini 9 crew, Elliot See and Charles Bassett, were killed while attempting to land their T-38 in bad weather. See misjudged approach and crashed into the McDonnell aircraft factory.
01.27.1967  TRAINING  An electrical fault sparked a blaze inside the Apollo 1 Capsule on a Kennedy Space Center launchpad, causing the deaths of the crew, Virgil "Gus" Grissom, Edward White II and Roger Chaffee
04.24.1967  FLIGHT  Soviet cosmonaut Vladimir Komarov died aboard Soyuz 1 when his parachute failed to deploy upon return to the Earth.
10.05.1967  TRAINING  Clifton 'C.C.' Williams died after a mechanical failure caused the controls of his T-38 supersonic jet trainer to be unresponsive. 
03.27.1968  TRAINING  Yuri Gagarin, the first human in space on Vostok 1 in 1961, died when his MiG-15 jet trainer crashed near Chkalovsky Air Base, Kirzhach, while he prepared for the Soyuz 3 mission. 
06.30.1971  IN SPACE  Soyuz 11 Crew Georgi Dobrovolski, Viktor Patsayev and Vladislav Volkov, died after undocking from space station Salyut 1 when a valve leak depressurized their capsule.  Their deaths were discovered by the ground team after a normal landing. 
01.28.1986  FLIGHT  Space Shuttle Challenger broke apart in mid-air 73 seconds after launch, resulting in the deaths of the entire crew: Greg Jarvis, Christa McAuliffe, Ronald McNair, Ellison Onizuka, Judith Resnik, Michael J. Smith, and Dick Scobee. 
02.01.2003  FLIGHT  Space Shuttle Columbia was lost upon re-entry to Earth's atmosphere, resulting in the deaths of the entire crew: Rick D. Husband, William McCool, Michael P. Anderson, David M. Brown, Kalpana Chawla, Laurel B. Clark, and Ilan Ramon were killed.