Denkinger was the first base umpire in Game 6 of the 1985 World Series. The St. Louis Cardinals led the Kansas City Royals by 3 games to 2 and had taken a 1–0 lead in the 8th inning. In the bottom of the ninth, Jorge Orta, the leadoff batter for the Royals, hit a slow roller to first baseman Jack Clark, who tossed the ball to the pitcher, Todd Worrell, who was covering first base. Denkinger called Orta safe, even though television replays and photographs clearly showed that he was out by half a step. The Royals went on to win Game 6 by the score of 2–1. Denkinger believed he had made the right call until he later met with CommissionerPeter Ueberrothafter the game and had the opportunity to see the replay himself. He said he was waiting to hear the ball land in Worrell's glove while watching the bag for Orta's foot and due to the crowd noise he never heard Worrell catch the ball. As crew chief of the 1985 World Series umpiring unit, Denkinger was scheduled to work behind home plate in Game 7, a fact that further upset the Cardinals and manager Whitey Herzog. The Royals won Game 7 by an 11–0 score, with Denkinger ejecting both Herzog and pitcher Joaquín Andújar in the fifth inning, following Andújar's animated displeasure with ball and strike calls. In the immediate aftermath of the 1985 World Series, Denkinger received many hateful letters, including death threats, from Cardinals fans. Two St. Louis disc jockeys went so far as to reveal Denkinger's telephone number and home address. Denkinger claimed that the letters continued on through 1987, when the Cardinals were ramping up for another World Series appearance, this time against the Minnesota Twins. Denkinger got into contact with Major League Baseball Security, who in turn contacted the FBI, when he received a particularly menacing letter with no return address, in which the writer said that if he sees Denkinger in person, he would "blow him away" with a.357 Magnum.
Late career
Two years later, Denkinger was behind the plate for the All-Star Game, and he was again named crew chief for the 1988 ALCS, 1991 World Series, and 1992 ALCS. He is one of only four umpires to have been selected as crew chief for the ALCS three times. Denkinger's last season as a full-time umpire was 1993; thereafter he umpired fewer than 100 games each season, umpiring his final game in June 1998. Over the course of his career, he umpired 3824 regular season MLB games.
Post-umpiring
More than 20 years after the 1985 series, Denkinger has regularly appeared at sports memorabilia shows willing to autograph photos depicting "The Call." Denkinger even owns a painting featuring himself, Todd Worrell, and Jorge Orta involved in the play, claiming that he keeps it to remind himself that no one is perfect and everyone makes mistakes. In September 2005, Denkinger was a guest speaker at a 20th anniversary dinner celebrating the 1985 St. Louis Cardinals season, benefiting the Whitey Herzog Youth Foundation.