In 2006, King's form declined and his best result came in the 2006 World Darts Trophy where he made the quarter-finals narrowly losing to Michael van Gerwen 4–5. He also made only the second round in the 2006 BDO World Darts Championship whitewashing Brian Woods 3 sets to 0 before losing to eventual champion Jelle Klaasen 2–4. His last tournament as a BDO affiliated player came in the 2007 BDO World Darts Championship where he made the semi-finals before losing 4–5 against eventual champion Martin Adams. King was surrounded by controversy during this tournament following speculation about his future and a possible switch to the PDC. This would prove to be his last tournament as a BDO player.