Chicago Fire has been going strong on NBC for twelve seasons now, and the hit drama is poised to hit the 250-episode milestone before the end of the spring 2024 TV schedule. While the original One Chicago show has managed to hold on to a surprising number of stars from the very beginning, there have also been a lot of departures and replacements over the years. The most recent to leave was Kara Killmer as paramedic Sylvie Brett, and she opened up about Fire's "revolving door" and all the other stars who have left.