Clifton Curtis 'C.C.' Williams (September 26, 1932 - October 5, 1967) was a NASA astronaut, a Naval Aviator, and a Major in the United States Marine Corps who was killed in a plane crash; he had never been to space. The crash was caused by a mechanical failure in a NASA T-38 jet trainer, which he was piloting to visit his parents in Mobile, Alabama. The failure caused the flight controls to stop responding, and although he activated the ejection seat, it did not save him. He was the fourth astronaut from NASA's Astronaut Group 3 to have died, the first two (Bassett and Freeman) having been killed in separate T-38 flights and (Chaffee) in the Apollo 1 fire earlier that year. The aircraft crashed in Florida near Tallahassee within an hour of departing Patrick AFB.