Yep, that was former MLB umpire Don Denkinger signing autographs, the Kansas City Star reported.

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Denkinger is (in)famous for his blown call in the ninth inning of Game 6 of the ‘85 World Series that cost the Cardinals the game and, after they were blown out in Game 7, a world championship.

Thirty years later, which end of I-70 you live on in Missouri affects how you see Denkinger. You either revel in his call or revile him for it.