SANTA CRUZ: Former West Indies all-rounder Dwayne Bravo has retired from professional cricket after 21 years and joined IPL champions Kolkata Knight Riders as a mentor. The 40-year-old suffered a groin injury earlier this week that prematurely ended his participation in the CPL. Kolkata announced his appointment as the mentor in a social media post on Friday. Bravo has 631 wickets in the format including T20 Int­ernationals and franchise leagues.