Believing that Cindy’s illness was just a cold, Herrmann returns to work at Firehouse 51. Cindy tells Herrmann that she plans to see a doctor. During the episode, Herrmann comes home to check on Cindy to learn that her condition has only become worse. In the episode, viewers learn that Cindy had been suffering from a cough and a fever for a while, which resulted in her struggling to take care of her five kids and house with Herrmann.
Is Cindy leaving Chicago Fire? Cindy Herrmann, the wife of senior firefighter Christopher Herrmann, discovered that she had lung cancer in season 11, episode 11, “Guy I Used to Know,” which aired on January 11, 2023.