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.
約翰尼·李·米勒 劉玉玲 喬恩·邁克爾·希爾 艾丹·奎因 艾米莉·斯沃洛 奧菲利亞·拉維邦德 塔姆辛·格雷格 瑞切爾·霍姆斯 杰米·托馬斯·金 塔拉·薩莫斯 戴夫·沙蘭斯基 費德里克·多爾德 薩弗蓉·布羅斯
克里斯蒂安·史萊特 阿曼達·皮特 安迪·巴克利 提拉·斯考比 瑞秋·凱勒 莉莉·多諾格 凱利·蘇利文 克里斯·梅森 Jules Willcox 卡梅隆·克羅維蒂 莉娜·喬格斯 Miles Emmons Jeff Marlow John O'Brien Andrew Lukich
麗貝卡·弗格森 科曼 哈麗特·瓦爾特 才那扎·烏奇 阿維·納什 亞歷山大·萊利 肖恩·麥克雷 雷米·米爾納 里克·戈麥斯 比利·波斯爾思韋特 克萊爾·珀金斯 阿什利·祖克曼 杰西卡·亨維克 勞拉·伊內(nèi)斯 杰西卡·布朗·芬德利 莫文·克里斯蒂 里德·伯尼 馬特·克拉文 科林·漢克斯 史蒂夫·扎恩