S3, E23: When the team finds the body of a widowed, singlemother in the trunk of her car, they are shocked to discover that the victim was in constant contact with Voight's (Jason Beghe) nowreformed 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.