S04E09 — Root Cause

When one of Reid Logan's five wives shows up at the station, she tells Frank and Nicco that she believes the death of Louise Logan, Reid's only legal wife, four months ago was foul play. While investigating, Nicco is intrigued by Libby, the most recent wife who took Louise's place as Reid's only legal wife. Mickey is beaten up by a suspect in the brutal deaths of the Williams' and their baby, and although Ali tries to help her, she soon crosses the line in her zeal to get Price and his partner.