She cultivates a relationship with Bubbles, a drug addict with an extraordinary memory for faces, and uses his information to identify Barksdale Organization members and begins to work out their methods.

At the end of the season, Kima is shot and critically wounded in an undercover buy bust operation ordered by Deputy Commissioner Ervin Burrell.

Kima moves on to investigating the leaders of the smuggling ring, but the trail runs dry just as the detail is closing on "The Greek" and his lieutenant Spiros Vondas.

He turns Kima and McNulty onto investigating the link between East side drug kingpin Proposition Joe and their old target Stringer Bell.

The case breaks down when the detail arrests Joe's nephew Cheese on suspicion of murder, due to misunderstanding a tapped conversation in which he was talking about putting down his pet dog.

The two pursue the Barksdale Organization even when the unit is supposed to be focused on the Park Heights drug dealer Kintel Williamson, and Freamon becomes exasperated with Greggs' lack of respect for Daniels.

As elections approach, Freamon picks up the investigation of the Barksdale money trail and serves subpoenas for financial records on many high-ranking political figures.

Fruit gets murdered, but Bunk Moreland from Homicide faithfully delivers his cellphone to the unit allowing them to identify more of the Stanfield network.

Kima surveils Old Face Andre, a drug dealer supplied by Marlo, and notices that his re-supply is delivered to his convenience store.

Because of the subpoenas, Mayor Clarence Royce threatens Commissioner Ervin Burrell for trying to charge campaign fundraisers weeks before the election.

When Kima and Norris attempt to interview a prisoner who claims to have information about the shooting, their investigation is again scuppered by Rawls, who orders Landsman to detail the two to uniform duty at a polling station.

Kima then picks out a detail in the case which leads her back to the crime scene, where she spots a ricochet mark in a nearby brick wall.

When Freamon quietly inquires how she's enjoying working Homicide, Kima tells him she's loving it, causing him to move along without offering her a position on the newly restructured Major Crimes Unit.

However, after witnessing Bubbles, her former CI, recovering from an attempted suicide Kima appears to have a change of heart and at the end of the season is seen back with the old unit once more.

The reconstituted Major Crimes Unit spends a year investigating the Stanfield Organization and their potential links to the vacant house murders.

The murder has been committed by Chris Partlow and Snoop on Marlo's orders, and the victims are a drug dealer named Junebug, his partner, and his bodyguard.

Kima and her partner on the case, Michael Crutchfield, recognize that the killings are professional in nature because of the disabling of the security cameras outside the house and the pattern of the wounds.

At the "wake" commemorating the end of McNulty and Lester's police careers, Kima arrives late and admits to them both that she blew the whistle.