The Chicago Fire season 12 finale shocked viewers when Jack Damon revealed he was Kelly Severide’s half-brother, but just a few episodes later, Damon left without giving closure to his story. During the season 13 premiere, lots of changes were underway in Firehouse 51. Chief Dom Pascal replaced Boden in Chicago Fire season 13, while Damon and Severide were adjusting to the revelation that they are related. The two brothers were getting along as Damon looked to Severide for guidance as a firefighter and Severide was open to helping his younger brother, but their bliss couldn’t last forever
Soon, it became apparent that Damon held Severide on a pedestal. Severide was his role model, and Damon was willing to do anything to impress his brother. However, that came at the cost of disobeying Stella Kidd’s direct orders during a call in episode 2. As his lieutenant, Damon should have listened to Kidd, but he went against protocol, making it clear that he didn’t respect her. Severide was forced to choose between his headstrong wife and his immature brother. Unfortunately, for Damon, he had to face the consequences of his actions, which meant leaving Firehouse 51 in Chicago Fire season 13.
Jack Damon Officially Leaves Firehouse 51 In Chicago Fire Season 13, Episode 4
Pascal Fired Damon In Episode 3
After Kidd requested to put Damon back into the floater pool, Pascal instead scolded the lieutenant for her high turnover rate on Truck 81, contemplating whether she should be the one to leave Firehouse 51. By the end of the hour, though, the new Firehouse 51 chief realized how good Kidd was at her job. Mouch vouched for Kidd and gave Pascal evidence proving that she was a great lieutenant and leader. As a result, Pascal fired Damon in Chicago Fire season 13, episode 3.
Damon was furious at Severide (since he was the one who told Kidd about his insubordination) and compared him to their abusive father, Benny Severide. However, Damon came to his senses one episode later and finally talked with Severide. Their conversation didn’t result in Damon getting his job back — it didn’t even hint at a potential return to the prestigious fire station. So, Damon officially left Firehouse 51 at the end of Chicago Fire season 13, episode 4.