The decision came as a shock as Braithwaite had been expected to return for a sixth season to complete the final year of his latest two-year contract.
In announcing Braithwaite’s departure, Roger Georgieff - Canterbury United chairman – hailed the head coach’s contribution to the franchise.
"It is with much regret that I announce the resignation of our Canterbury United Head Coach, Keith Braithwaite," Georgieff said.
"Keith has always given this club 110 percent and his driven nature and determined motivation of those around him will leave a lasting legacy for us all.
“Keith's passion for Canterbury United was second to none and possibly unrivalled amongst other sporting codes at elite level within Canterbury.”
Braithwaite had five successful seasons with the ASB Premiership franchise, including four trips to the competition playoffs and one Grand Final appearance in the 2009-2010 season.
As preparations for season 2014/15 are about to start, the search for the team’s new head coach will begin immediately.
Story courtesy Canterbury United