The altercation came as the result of McCaskey arriving at some of his seats in the stadium bowl area of Soldier Field to find a couple of Saints fans sitting in them. McCaskey conversed briefly with one of the fans before heading to the concourse area to get stadium security.
As McCaskey walked in that direction, the fan approached the chairman from behind and pushed him in the back.
A Bears fan immediately came to McCaskey's aid, according to the team, and tackled the Saints fan.
Shortly after, security arrived and ejected the Saints fan from the stadium. The fan, Richard Kohnke, 58, of New Orleans, was processed by police at the stadium and charged with misdemeanor battery, according to authorities.
McCaskey did not require medical attention.