 Former UConn star Kemba Walker hanging up his sneakers. The 34-year-old announced his retirement from the NBA after 12 seasons. After leading UConn to the national championship in 2011, Walker was drafted ninth overall by the then Charlotte Bobcats. He is still their all-time leader in points, three-pointers, and minutes played. Walker later played an injury-plagued season with the Knicks. Cleveland Cavaliers have locked up all-star Donovan Mitchell to a three-year, $150 million max contract extension.