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They are wearing JK on their sleeves honor of the late John Kibler. Kibler was an umpire from 1963 until 1989. He was the umpire at first base in game 6 or the 1986 World Series. He was 81 at the time of his death.
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Earn +20 ptsQ: Why are major league umpires wearing JK on their sleeves?
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