VIDEO: Sneak Peek - BLUE BLOOD's 'Old Wounds' Episode on CBS

On Friday night's episode of the CBS drama series BLUE BLOODS titled 'Old Wounds,' Danny believes a serial killer is on the loose when two separate murder victims are identified as members of a group charged with a gang rape. Meanwhile, Erin’s ex-husband, attorney Jack Boyle, resurfaces in her life as they face off in court. The episode airs Friday, October 12 (10:00-11:00 PM, ET/PT) on the CBS Television Network. Peter Hermann ("Law & Order: Special Victims Unit") guest stars as Jack Boyle, Erin’s ex-husband. Get a sneak peek below!