At the beginning of the season Sylvia becomes pregnant with Andy's child. A baby boy, Theo, is born towards the end of the season. This is contrasted with the fate that awaits Sipowicz's older son, Andy Jr., who announces that he is to join the police force. Andy is finally bonding with his estranged son when he is gunned down, which leads the elder Sipowicz to fall off the wagon. Andy Jr's murderers are killed themselves by Simone in an act of self defense. Bobby and Diane, whose relationship had been put on hold while she attended AA, resume their relationship only for Diane to begin drinking again when her abusive father beats her mother. Her father is eventually killed and her mother becomes the prime suspect. James Martinez and new detective Adrienne Lesniak begin an affair but only after Lesniak tells Medavoy that she is gay, then that she is not; Martinez later breaks up with her due to her controlling and unpleasant behavior, and Lesniak eventually leaves the squad. Medavoy himself leaves his wife, recognizing that she is holding him back but it is too late to save his relationship with Donna who leaves to take up a job with Apple.
塞西尔·德·弗朗斯,木村拓哉,亚历山大·卡里姆,莉奥妮·贝尼希,凯丽·考贝特,莎伦·邓肯-布鲁斯特,杰克·格林利斯,平岳大,克里斯塔·科索恩,芭芭拉·苏科瓦,莉迪亚·威尔逊,克拉斯·霍佛-乌姆劳夫,埃迪恩·杰拉里,奥利弗·马苏奇,克拉迪亚·朱尔特,雅各波·奥尔莫·安蒂诺里,Rosabell Laurenti Sellers,Joshua Odjick,Dutch Johnson