Eric Cooper, a veteran Major League Baseball umpire who worked the American League Division Series between the Yankees and the Minnesota Twins just two weeks ago, has died in Iowa. He was 52 .

Commissioner Rob Manfred said on Sunday that Cooper died after having a blood clot. He had had knee surgery earlier in the week and was recuperating at his father’s home in Iowa. On Saturday he was talking to fellow umpires about his recovery.

Cooper made his debut in the majors in 1996 as a minor league fill-in and joined the big league umpiring staff in 1999. His most recent assignment was at second base for Game 3 of the A.L. division series at Target Field in Minneapolis on Oct. 7, when the Yankees completed their sweep of the Twins.

Cooper worked the 2014 World Series between the Kansas City Royals and San Francisco Giants. He drew that assignment in part because of his success rate on replay challenges; M.L.B. took those numbers into account in picking the crew, and Cooper had only three calls reversed all season.