Chicago PD 4x20 - Grasping for Salvation

While investigating the murder of a teenage boy, Voight findsa connection with the murder weapon - linking it to a case thathe worked on 17 years ago. While the victim's father, aprominent defense attorney, tries to get the case taken overby Area Central Homicide, Voight digs back into the old caseunder the watchful eye of his former partner, Lieutenant DennyWoods.