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The Mavs have signed veteran guard and four-time All-Star Kemba Walker to assist their struggling offense. The 32-year-old has not played this season and been a free agent since being waived by the Pistons back in October. In 37 games for the Knicks last season, Walker averaged 11.6 points and 3.5 assists per game. In a corresponding move, the Mavs waived guard Facundo Campazzo. Dallas returns to the court tonight against the Warriors.