 His final season was a triumph as the Roosters won the 2002 NRL Grand Final, defeating the New Zealand Warriors 30–8 at Telstra Stadium in front of 80,130 fans.It was the clubs first premiership since 1975, and saw him join his father as a premiership winner with the club (coincidentally, Bill Mullins had also played on the wing for the Roosters).Brett Mullins made his senior representative début for NSW Country in the annual City vs Country Origin game played at the Sydney Football Stadium on 24 April 1992.