NBC has released the official episode synopsis for the 4th episode of Chicago PD season 8. Chicago PD season 8 episode 4 is titled “Unforgiven”.
Chicago PD 8×4 “Unforgiven” Episode Guide
A cop is murdered and suspicion falls on someone who has been holding a grudge against the officer. Intelligence works hard to solve the case but Dep. Supt. Samantha Miller is hesitant to defend him until she knows the whole story.
Chicago PD season 8 episode 4 airs on January 13 at 10|9c on NBC.