 He retired in 2015.During the 2008–09 Heineken Cup quarter final against Leinster, Williams was told to fake a blood injury by Dean Richards to allow a tactical substitution to reintroduce Nick Evans leading to the bloodgate scandal.This resulted in a 12-month ban for Williams, (reduced to four months on appeal), a three-year ban for former director of rugby Dean Richards as well as a two-year ban for physiotherapist Steph Brennan from the ERC with a £260,000 fine for the club.