Didier was a tight end in the National Football League (NFL) for the Washington Redskins from 1982 to 1987 and for the Green Bay Packers from 1988 to 1989. Didier won two Super Bowl rings as a member of the Redskins, in Super Bowl XVII and Super Bowl XXII. He was also the Redskins' second leading receiver in Super Bowl XVIII, catching five passes for 65 yards in their 38-9 loss. He scored a touchdown in Super Bowl XXII. He finished his NFL career with 141 receptions for 1,923 yards and 21 touchdowns in 105 games.