Chilling clown paintings by America's worst serial killer John Wayne Gacy who was the inspiration for hit horror 'It' on sale

John Wayne Gacy Jr. sexually assaulted, tortured and murdered at least 33 teenage boys and young men between 1972 and 1978 in Illinois - but he was also the painter of some creepy clown pictures. The rare artwork even features Pogo the Clown, evil Gacy's alter-ego during his killing spree, and messages written by him. The daubings by Gacy who was the inspiration for hit horror 'It' are expected to sell for up to £7,000 each.

(Image: Getty Images)