10 One Chicago Exits That Left Fans Heartbroken (And Still Not Over It)

The One Chicago universe has experienced many significant losses across all series, but some have been more devastating than others. Heading into the 2025–2026 network TV season, NBC’s popular franchise (which includes Chicago FireChicago PDChicago Med, and Chicago Justicehas produced 36 seasons and almost 730 episodes, and it’s showing no signs of stopping. With more seasons and episodes on the way, there are sure to be many more heartbreaking departures, given the nature of the three current shows.

The One Chicago franchise features characters running into burning buildings, chasing down dangerous criminals, and treating patients in the emergency department of one of the city’s biggest hospitals. So, while some jobs are more perilous than others (looking at you, Chicago Fire), death is all around the characters. They lose people almost every season. Of course, some characters leave the One Chicago universe in one piece, but that doesn’t make their exits hurt any less. No matter how they leave, significant characters departing their respective series will always be upsetting.

10Leslie Shay

Played By Lauren German

Leslie Shay’s tragic death in Chicago Fire season 3 was the One Chicago franchise’s first major loss, and it still stings to this day. During the season 2 finale, almost the entire Firehouse 51 crew (sans Chief Boden) entered a building that seemingly only had a small fire inside. However, an explosion wracked the structure, leaving the audience wondering the fates of several characters. Unfortunately, they had to wait a few months until the season 3 premiere, which revealed that Shay had died in the explosion.

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A falling pipe had struck Shay in the head, and there was no saving her (no matter how hard Gabby Dawson tried). The entire firehouse was left stunned by the loss of Shay, as was the audience. Watching the Chicago Fire characters, especially Kelly Severide, grieve Shay was heartwrenching, and even after all these seasons, Shay’s death is arguably the most devastating.

9Brian “Otis” Zvonecek

Played By Yuri Sardarov

The other character competing for Chicago Fire‘s most heartbreaking death is Brian “Otis” Zvonecek. Like Shay, Otis had been around since the show’s beginning. However, he lasted a few more seasons than the paramedic, as he died during the season 8 premiere, much to everyone’s surprise. Otis was a mainstay character, and his departure was certainly a hard pill to swallow.

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During the procedural drama’s season 7 finale, Firehouse 51 responded to a mattress factory fire. Unfortunately, a boiler exploded inside, causing a backdraft that gravely wounded Otis when it thrust him against a steel door. Although it was closed by the impact, saving the other firefighters, it would lead to Otis’s Chicago Fire death. He died from his injuries at the hospital. But before he left, Otis told Cruz, in Russian, “Brother, I will be with you always,” completely wrecking viewers and ensuring that the loss of Otis would never be forgotten.

8Chief Wallace Boden

Played By Eamonn Walker

Eamonn Walker as Chief Boden looking out in the distance on Chicago Fire

Thankfully, Eamonn Walker’s Chief Wallace Boden didn’t die when he left Chicago Fire. Nevertheless, his departure was quite upsetting. Boden had served as Firehouse 51’s chief since season 1, and it felt like it would always be that way. But, everything changed during the season 12 finale when Boden accepted a new position as the Chicago Fire Department’s Deputy Commissioner.

Boden can no longer be regularly seen hanging around Firehouse 51, as Dermot Mulroney’s Chief Dom Pascal is now in charge, and that has been difficult getting used to.

Thankfully, the new role meant that Boden could realistically return to Chicago Fire, even after his exit (like in season 13, episode 18). His absence is still significant in the NBC procedural drama, though. Boden can no longer be regularly seen hanging around Firehouse 51, as Dermot Mulroney’s Chief Dom Pascal is now in charge, and that has been difficult getting used to.

7Darren Ritter

Played By Daniel Kyri

Daniel Kyri as Darren Ritter in Chicago Fire.