North East hiker Duncan Paylor fooled Jimmy Carr, Alison Hammond and Amanda Holden into thinking he could sing on BBC's I Can See Your Voice.
At first comedian Jimmy Carr joked that Duncan had "a mountain to climb" if he was going to convince the celebrity investigators that he could sing. But the passionate fundraiser managed to bluff his way to the end of the show and scoop the £10,000 prize.
Duncan, a security installation engineer, from Newcastle, was one of six contestants to take part in the gameshow, hosted by Paddy McGuinness, which aired on Saturday. He was joined by a tennis champion, a 999 call handler and a social media star, who were each investigated as players Tracy and Michelle tried to tell the difference between good and bad singers.