05/25/2016 (10:00PM - 11:00PM) (Wednesday) : SEASON FINALE - A CASE TURNS PERSONAL FOR INTELLIGENCE WHEN VOIGHT'S SON IS CONNECTED TO A MURDER INVESTIGATION. - When the team finds the body of a widowed, single-mother in the trunk of her car, they are shocked to discover that the victim was in constant contact with Voight's (Jason Beghe) now-reformed son, Justin (guest star Josh Segarra). After Lindsay (Sophia Bush) and Voight find Justin has been attacked in the same manor and is critically injured, Antonio (Jon Seda) and the team know that Voight will be out for revenge. Meanwhile, Roman (Brian Geraghty) makes a difficult decision and Commander Crowley (guest star Barbara Eve Harris) has plans to make changes within the unit. Also starring Jesse Lee Soffer, Patrick Flueger, Elias Koteas, Marina Squerciati, LaRoyce Hawkin and Amy Morton. Guest starring S. Epatha Merkerson, Marlyne Barrett and Samuel Hunt.