Cowboys release Tonga | COWBOYS RELEASE TONGATHE North Queensland Toyota Cowboys have today released centre Willie Tonga from thefinal year of his contract to pursue other opportunities with his rugby league career.General Manager - Football Peter Parr said Tonga, who has been a valued member of theCowboys' squad for the past three seasons, would remain a key part of the club's 2011NRL campaign.The Cowboys and Tonga have mutually agreed that it is best for him to seek a contract atanother club from the end of this season.Tonga said his decision to leave the Cowboys a year earlier than expected was not forfootball-related reasons, but rather for a change of lifestyle.