Hans Fleischmann

In the season premiere, as the Sheldon Jin murder investigation moves forward, Voight (Jason Beghe) is under close watch by Internal Affairs but he’s still in complete command of the intelligence unit. A routine undercover job becomes anything but when Voight’s SUV is T-boned while trailing an armored car carrying Ruzek (Patrick Flueger). At District, Burgess (Marina Squerciati) meets her new partner, Sean Roman (Brian Geraghty) and tension is high from the start. Soon she realizes there’s more to his story. After a long day, Lindsay pays a visit to someone she hasn't seen in a very long time -- her mom, Bunny (guest star Markie Post). Jon Seda, Jesse Lee Soffer, Elias Koteas, LaRoyce Hawkins and Amy Morton also star. Stella Maeve, Robert Ray Wisdom and Ian Bowen guest star.

It's a family reunion when Dawson (Monica Raymund) and Antonio's (guest star Jon Seda) mother and father come to Chicago for their big anniversary party, but things quickly turn south. When a deep secret comes to the surface involving his stepson James (guest star Juan Lozada), Chief Boden (Eamonn Walker) decides to take matters into his own hands. Meanwhile, Casey (Jesse Spencer) tries to save a young boy during a harrowing call to a warehouse and Otis (Joe Minoso) and Kidd (Miranda Rae Mayo) become competitive at the mud hundred race.

Following the shocking events related to a fallen officer, Teresa and Jarek vow to bring whoever is responsible to justice. In the meantime, Alderman Gibbons pays a visit to the victim’s family to offer his condolences and plant a few seeds of betrayal, implicating members of the Chicago Police Department. As every officer in the city hits the streets to avenge this cop killer, Jarek and Caleb follow up on some of Liam’s leads, while Vonda and Isaac are promoted to the organized-crime task force.