Chicago Fire is going through some cast changes — which means not everyone is returning for season 15. The One Chicago franchise has been known for making headlines over the years as cast members often come and go across all three shows: Chicago Fire, Chicago Med and Chicago P.D. Before Chicago Fire returned for season 15, multiple outlets confirmed that Joe Miñoso was leaving the hit NBC series. Off screen, showrunner Andrea Newman exited the show after more than a decade. Newman, who worked on Chicago Fire for its entire 14-season run, confirmed her departure in April, with coexecutive producer…