Played by James Rebhorn Captain Cathal "CT" Finney Father of Brendan Finney, CT worked in IAB. However, he was not as innocent as he appeared; he had been involved in the death of Tyrone Davis Senior many years earlier. He, Davis Sr and a few others had been corrupt cops, and planned to put the blame on Davis Sr. Davis Sr decided to go to IAB, but Finney found out and arranged for Davis Sr to be murdered. Finney was in charge of an operation involving Sgt Maritza Cruz, which involved Detective Sasha Monroe going undercover as an officer. Not long after Brendan started working at the 55, Finney committed suicide as the truth about Ty Davis, Sr was threatened with exposure, and his son made it look like an accident so his family could still claim his pension and benefits. Played by Charles Haid, apart from a flashback in "Forever Blue" where the younger Finney was played by Jeff Mantel. Detective "Jelly" Grimaldi "Jelly" Grimaldi was an overweight veteran homicide detective, often seen chugging coffee from a styrofoam cup, who appeared in seasons 5 and 6. He has known Sully for years. His real first name was never revealed on the show. Played by Joe Badalucco. Officer Steve Gusler A rookie during Season 3, Gusler didn't really fit in with the job or the precinct. He was partnered with Bosco on his first day, due to Bosco's partner Faith Yokas being on leave. Bosco did not have much time for the young rookie. Later Gusler was partnered with Faith when Bosco thought about joining ESU. Gusler usually appeared nervous and frightened, and after gravely shooting a fellow officer (accidentally) during a major shootout realized he was not meant to "walk the beat," but later became a police sketch artist. Played by Charlie McWade. Officer Conrad "Candyman" Jones Nicknamed because of his love of candy, Candyman was regarded as a good cop by everyone in the precinct, cops and civilians alike. The cops knew that he was prone to taking bribes and robbing drug dealers, but did not say anything about it as otherwise he was a good cop. After finding out that his father had worked with Candyman and had also taken bribes, Ty Davis fought with himself about whether to turn Candyman in especially after seeing him rob a pimp. After Candyman saved his life, Ty decided not