Walters was selected by Queensland to play at hooker for game I of the 1990 State of Origin series, being replaced by his brother Kerrod for games II and III. Walters played in the 1990 NSWRL season's grand final at hooker in the Raiders' victory over the Penrith Panthers. Walters was selected as Queensland's hooker for all three games of the 1991 State of Origin series, being named man-of-the-match in game II. He was then selected as Australia's hooker for all three games of the 1991 Trans-Tasman Test series against New Zealand. The Canberra Raiders reached the 1991 NSWRL season's grand final and Walters played at hooker in the loss to the Penrith Panthers.