Season 4

01 The Vanishing Policeman Episode 122nd March 2016 While Detective Angie Flynn and Staff Sergeant Vega adjust to his new role, the suicide of an officer with whom Angie and Detective Brian Lucas worked on a crime scene turns the team’s investigation into a hunt for a cop killer. 02 The Dead Name Episode 229th March 2016 Angie fills in as staff sergeant while investigating a football player's wife's murder. 03 Index Case Episode 35th April 2016 The team goes after a killer who is spreading a lethal pathogen across the city. 04 The Score Episode 412th April 2016 Angie and Paula investigate the murder of an ex-con. Vega faces his boundary issues with Dr. Rogers and Lucas. 05 The Scorpion and the Frog Episode 519th April 2016 A murder with a familiar signature could mean a woman was wrongly convicted of a crime. 06 Interference Episode 626th April 2016 The murder investigation of a suburban mom takes a turn when her child is abducted. 07 The Dead Hand Episode 75th July 2016 Angie stays with a soldier who demands justice by taking the bullpen hostage. 08 Foreign Relations Episode 812th July 2016 Angie partners with an international agent to investigate the murder of a British politician's son. 09 Remains To Be Seen Episode 919th July 2016 The team goes on a hunt through the past to find the killer of a video game designer. 10 In Plain Sight Episode 1026th July 2016 A woman is found nail-gunned to death. Angie embraces her relationship with Jack. Vega's frustrations force him to look for other options. 11 Natural Selection Episode 112nd August 2016 A woman is murdered with what appears to be a medieval weapon. 12 Chronology of Pain Episode 1223rd August 2016 Angie races to catch a killer who is an expert at covering their tracks. 13 We'll Always Have Homicide Episode 1330th August 2016 Three years after a killer gets away, the team reunites to close the case.