Ken 'TK' Mattingly, Apollo 16 astronaut, dies at 87
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Portrait of NASA astronaut Thomas 'Ken' Mattingly II wearing his space suit, Apollo 16 Command Module pilot following his replacement on the Apollo 13 mission, December 20th 1971. (NASA/Hulton Archive/Getty Images)
Apollo 16 astronaut Ken "TK" Mattingly has died at age 87. He circled the moon and flew the shuttle but may be best remembered for the mission he didn't fly: The ill-fated Apollo 13.
