Sophia Bush‘s former costars from Chicago P.D. have made rare comments over the years about her surprising exit from the show. Chicago P.D., which premiered in 2014, was introduced as a spinoff of Chicago Fire. It follows the uniformed patrol officers and the Intelligence Unit of the 21st District of the Chicago Police Department as they pursue the perpetrators of the city’s major street offenses. Bush joined the show in season 1 in the role of Erin. She filmed four seasons before announcing her exit in 2017. In the years since her departure, Bush has opened up about dealin...