“Stanley “Stan” Shunpike was a wizard and was the conductor and helper of the Knight Bus. In 1996, he was arrested and sent to Azkaban for being a Death Eater when he was overheard claiming to have inside information about the organisation, although in all likelihood, he was only fooling around. In 1997, he broke free from prison and joined the Death Eaters under the Imperius Curse. His fate after the war is unknown; he most likely awoke from the Curse following Lord Voldemort’s ultimate defeat, like all the other Imperiused victims, and returned to his job.”
[x]