the pilot episode, Phil Roussakoff (Michael DeLuise), a burly officer, transferred to the 74th Precinct and was partnered with Jimmy Doyle (Dylan Walsh), a well liked and respected street cop whose younger brother, Terry (Patrick McGaw), was trying to become a police officer to follow in their late father's footsteps. Terry left the police academy to take an undercover assignment to infiltrate an Irish street gang planning a bank robbery. Roussakoff briefly dated Jimmy and Terry's younger sister, Kathleen (A. J. Langer), but was awkward and uncomfortable to dating. Terry helped foil the Irish gang's robbery, and he ended up joining the police vice squad anti-crime unit. Jack Lowery (Titus Welliver) was a tough street cop coping with personal demons which included his selfish and nagging wife, Yvonne, who died early in the season. Lowery later started an affair with his female partner, Nona Valentine (Klea Scott), which did not sit well with Clement Johnson (Richard T. Jones), Nona's former boyfriend and the station's traffic cop. Eventually Nona and Clem got back together, then broke up, and by the series end, Nona got back together again with Lowery. Hector Villaneuva (Adam Rodriguez) was a young rookie cop who was tutored by the rest of the officers how to do his job the best be could. Richard Santoro (Gary Basaraba) was the station's desk sergeant, a police veteran who had seen it all and was the voice of reason in the station house, keeping things calm. Santoro later stuck up for Donovan when he came out as an informant for Internal Affairs Bureau to save Santoro from a corrupt IAB officer who was trying to ruin Santoro's reputation. Ray MacElwaine (John Finn) was a 50-year-old veteran police officer who transferred to the 74th Precinct late in the series and soon proved himself to everyone that despite his age, he could still "walk the beat" and take down criminals. MacElwaine also stuck up for Donovan after finding out Donovan's work with IAB. In the series final episode, MacElwaine decided to retire from the police force, and Santoro was promoted to Lieutenant. So, Captain Jonas threw a double-party for the entire police station in celebrating Santoro's promotion and MacElwaine's retirement. In his speech, MacElwaine changes his mind and decides not to retire, to great celebration. Other secondary characters included Kevin Patrick (Mark Kiely), a police officer wounded in the opening shooting spree in