A former medical student who joins Ambulance 61 as Sylvie Brett’s new partner. Monica Raymund Departure Left to lead relief efforts in Puerto Rico. Jerry Gorsch Steven Boyer Recurring Antagonist The Commissioner's oversight officer sent to monitor Boden. Crossover Guide

Season 7 features two major events within the universe: Chicago Fire Season 7: Here's How Dawson Left - TV Guide

Chief Boden (Eamonn Walker) faces constant interference from the new commissioner, Carl Grissom. Grissom’s sycophant, Assistant Deputy Commissioner Jerry Gorsch, is stationed at Firehouse 51 to micromanage and undermine Boden's leadership.

Season 7 of is a turning point for Firehouse 51, marked by the departure of a founding character, high-stakes political battles, and intense arson investigations. Major Story Arcs

The season begins with Matthew Casey (Jesse Spencer) adjusting to life after Gabby Dawson (Monica Raymund) moves permanently to Puerto Rico. Though she returns briefly for a final goodbye, the "Dawsey" era officially ends with a divorce later in the season.

The final episodes focus on a cold case arson investigation that Severide reopens, linking a recent salon fire to a serial arsonist his father once pursued. Cast Changes Emily Foster Annie Ilonzeh New Series Regular

Following the sudden death of his father, Benny Severide, Kelly Severide (Taylor Kinney) struggles with grief. This emotional turmoil puts a strain on his relationship with Stella Kidd, eventually leading to a temporary breakup before they reconcile toward the season's end.