TENSION BETWEEN VOIGHT AND ANTONIO BUILDS AS INTERNAL AFFAIRS DIGS INTO A MURDER CASE WHICH POTENTIALLY INVOLVES VOIGHT’S SON – The Fitori murder case is brought to the intelligence unit and Voight’s (Jason Beghe) son, Justin (guest star Josh Segarra), may be involved. Gradishar (guest star Robin Weigert) fills Antonio (Jon Seda) in on the arrangement between Internal Affairs and Voight which increases friction between Voight and Antonio. Back at the precinct Ruzek (Patrick Flueger) helps Burgess (Marina Squerciati) get back at desk sergeant Platt (guest star Amy Morton). Sophia Bush, Jesse Lee Soffer, Elias Koteas, LaRoyce Hawkins and Archie Kao also star. America Olivo and Joseph Reegan guest star.