Nigger died on 16 May 1943, the day of the famous "Dam Busters" raid, when he was hit by a car. He was buried at midnight as Gibson was leading the raid. "Nigger" (Morse code: -. .. --. --. . .-. ) was the codeword Gibson used to confirm the breach of the Möhne Dam. Nigger's grave is at Royal Air Force station Scampton, Lincolnshire. In July 2020 the headstone was replaced, with his name removed. The RAF said it "did not want to give prominence to an offensive term that went against its ethos".