The One Chicago franchise, which follows the lives of firefighters, doctors and police officers working and living in the Windy City has been a huge hit with fans since it began airing over a decade ago.
MORE: Chicago PD star Marina Squerciati shares first day back on set picture
But, sadly, some of the stars are no longer with us. Carry on reading to take a look back at the stars who have sadly passed away as we celebrate their legacy…
WATCH: Are you fan of the One Chicago franchise?
Anne Heche
Anne held a recurring role on Chicago PD throughout the show's sixth and seventh seasons, playing Deputy Superintendent Katherine Brennan, who viewers quickly learnt was a force to be reckoned with. She sadly passed away at the age of 53 in August 2022 after being in a coma for a week after crashing her car into a house in Los Angeles.
MORE: Chicago Fire star shares huge season 11 update - and fans will be thrilled
MORE: Meet the cast of Chicago Fire and their real-life partners
Lindsey Pearlman
Lindsey Pearlman appeared on the short-lived fourth Chicago series, Chicago Justice, back in 2017 but in February 2022 the 43-year-old was found dead near the entrance to Runyon Canyon where many celebrities are often spotted hiking, five days after going missing. It was confirmed that she had sadly died by suicide.
DuShon Monique Brown
DuShon Monique Brown appeared on Chicago Fire, playing Connie, the assistant to Eamonn Walker's Chief Boden and was a fan favorite among audiences and her passing in March 2018 came as a shock to all. While there was initial uncertainty about her cause of death, it was later confirmed that she had died from sepsis, a blood infection of unknown origin.
Molly Glynn
Molly Glynn appeared in a recurring role on Chicago Fire, playing an emergency room doctor but had her life cut short in 2014 after a tree toppled by a powerful storm struck her. The 46-year-old had been on a bike ride with her husband at the time of tragedy.
Markie Post
Markie Post played Barbara' Bunny' Fletcher, the mother of Sophia Bush's character Detective Erin Lindsay in Chicago PD, appearing in multiple episodes across seasons two to four. She passed away in 2021 after battling cancer for nearly four years.
MORE: See the cast of Chicago PD and their real-life partners
Tuesday the dog
Tuesday, the beloved canine companion of Chicago Fire's Darren Ritter (Daniel Kyri) died in May 2022 at the age of four from kidney issues, just days before her last appearance on the show at the wedding of firefighters Kelly Severide (Taylor Kinney) and Stella Kidd (Miranda Rae Mayo). She appeared from season seven onwards and became not only a fan favorite but the 51's official mascot.
Read more HELLO! US stories here
Like this story? Sign up to our What to Watch newsletter to get other stories like this delivered straight to your inbox.