<Li> Ray Liotta as Lieutenant Matt Wozniak, the corrupt commander of the 64th Precinct's Street Crimes detective squad, and the main target in an FBI anti-corruption investigation . He is a 25 - year veteran of the force, and before that spent six years in the United States Marine Corps . He is very close to Harlee, whom he considers a daughter, and Harlee's own daughter, Cristina . </Li> <Li> Drea de Matteo as Detective Tess Nazario, reassigned to patrol as a sergeant in season 3 . </Li> <Li> Warren Kole as Special Agent Robert Stahl, an FBI agent assigned to the Anti-Corruption Task Force, and Harlee's handler . He develops an obsession with Harlee . </Li> <Li> Dayo Okeniyi as Detective Michael Loman, a rookie detective assigned to the 64th . </Li>

Who plays the fbi agent in shades of blue