 He re-joined the Manawatu Jets for the 2004 New Zealand NBL season and won the Garry Pettis Memorial Trophy for leading the league in rebounding.For the 2004–05 NBL season, Cooper joined the Adelaide 36ers, the team he continued to play for until 2010 when he retired from the league following the 2009–10 NBL season.In 293 ANBL games over 10 seasons, he averaged 5.2 points, 4.9 rebounds, 1.0 assists and 1.1 blocks per game.