The One Chicago universe—comprising Chicago P.D., Chicago Fire, and Chicago Med—has long been a staple for fans of high-stakes drama and complex character arcs. Yet, over the years, viewers have been left reeling as beloved characters made unexpected exits, leaving behind unanswered questions and emotional voids. Let’s delve into seven of the most heart-wrenching departures that continue to haunt fans, uncovering the real reasons behind these exits.

 Tracy Spiridakos (Hailey Upton, Chicago P.D.)

Introduced in Season 4 and promoted to series regular in Season 5, Tracy Spiridakos’ portrayal of Detective Hailey Upton quickly became a fan favorite. Her on-screen chemistry with Jesse Lee Soffer’s Jay Halstead added depth to the series.

However, after seven years, Spiridakos decided to leave, citing a desire to explore new opportunities and challenges beyond the show. She expressed that it was a difficult decision, given her close bonds with the cast and crew .​

 Jesse Lee Soffer (Jay Halstead, Chicago P.D.)

As one of the original cast members, Jesse Lee Soffer’s departure in Season 10 shocked many.