Last Rites, Part 1

S3, E1: The execution-style death of an off-duty cop rattles Barry Tregear, who asks Jack to tail ex-cop Mick Khoury, which Jack accomplishes in between parenting tasks. But when Khoury catches Jack and attacks him, the panic and shock give Barry a heart attack. At the hospital, Barry lets slip something about Isabel’s death that shakes Jack to the core and prompts him to begin reinvestigating her murder.