Jason Beghe Sergeant Hank Voight Actor Sophia Bush Detective Erin Lindsay Actor Patrick Flueger Officer Kyle Ruzek Actor LaRoyce Hawkins Officer Kevin Atwater Actor Elias Koteas Detective Alvin Olinsky Actor Jon Seda Detective Antonio Dawson Actor Jesse Lee Soffer Detective Jay Halstead Actor Marina Squerciati Officer Kim Burgess Actor Amy Morton Desk Sgt. Trudy Platt Actor Brian Geraghty Officer Sean Roman Actor Lucy Blehar Felicia 'Sierra' Hughes Guest Star Gary Perez Fabian Sosa Guest Star Nick Gehlfuss Will Halstead Guest Star Stella Maeve Nadia Decotis Guest Star Kevin J. O'Connor Commander Fischer Guest Star Samuel Hunt Greg Gerwitz Guest Star Kale Clauson Mason 'Mad Max' Rutowski Guest Star Jesse Dabson Keith Hughes Guest Star James T. Alfred Agent Rose Guest Star Kathy Scambiatterra Medical Examiner Guest Star Howie Johnson Sgt. Conroy Guest Star Dick Wolf Executive Producer Matt Olmstead Executive Producer Michael Brandt Executive Producer Derek Haas Executive Producer Peter Jankowski Executive Producer Danielle Gelber Executive Producer Joe Chappelle Executive Producer