 Williams was first elected to the Welsh Assembly on 1 May 2003 and was re-elected in 2007; serving until his death in 2011.He was Shadow Minister for Rural Affairs from 14 July 2007 and sat on the Sustainability, Rural Development, and Standards committees.Williams had also been the Conservative spokesman for Environment, Planning and Countryside and Local Government in the Second Assembly (2003–07), during which time he was Chair of the North Wales Regional Committee.