Career
He challenged seven other swimmers on the sixth heat, including top medal favorites Brendan Hansen of the United States and Dániel Gyurta of Hungary. He raced to sixth place by more than a second behind Gyurta"s teammate Richárd Bodor, outside his entry time of 2:15.75. Williamson failed to advance into the semifinals, as he placed twenty-second overall in the preliminaries.
Three months after the Games, Williamson announced his retirement from swimming, following a controversy which questioned and rattled his Olympic bid.