Former astronaut Michael Collins (1930-2021). He was part of the Apollo 11 crew (with Neil Armstrong and Buzz Aldrin) that made the first walk on the Moon. Collins was Command Module Pilot. The trade off from the method of Lunar Orbit Rendez-Vous, of which the advantage was that it significantly reduced the launch weight of the rocket, was that a crew member would stay behind in the Command Module, while the two others landed on the Moon. On Apollo 11 this was Collins' task. He also faced the risk of having to return to Earth alone, if an accident would happen with the Lunar Module.
Apollo 11 was his second, and last space flight. In July 1966, he had already flown with Gemini X.
From the Apollo 11 crew, only Aldrin is still alive.