A deskbound Freamon took a hobby of making dollhouse furniture, which provides him with a substantial supplemental income and contributes to his eccentric reputation among fellow police.

At the end of the series, it was revealed that Freamon had joined the department in the early 1970s, around the same time as Bill Rawls, Ervin Burrell and Howard "Bunny" Colvin, yet focused solely on police work and never obtained rank.

Freamon proves himself adept at building the Barksdale case through the use of a wiretap; he recognizes patterns of pager messages and telephone calls, which lead to several breakthroughs, most notably finding the main stash house in Pimlico.

He also leads the investigation into the Barksdales' financial records and uncovers their various political connections, instructing Leander Sydnor and Roland Pryzbylewski in the mechanics of following the paper trail.

They determine that the women in the container suffocated after an air pipe was deliberately closed off, and that a fourteenth victim whose body was picked up by McNulty, is tied to the case.

Based on the few facts they have, Freamon and Bunk deduce that the women were prostitutes being smuggled in from overseas, that one of the girls was murdered by a sailor after refusing sex, and that the rest were killed for witnessing the crime.

The investigation closes with several arrests and, in the process, Freamon identifies a dismembered body killed by The Greek's crew as being one of the crewmen who jumped ship.

Freamon stays with Daniels in the now-permanent Major Crimes Unit, building a case against their assigned target, a drug dealer named Kintel Williamson.

When the unit's focus is returned to the Barksdales, Freamon is stumped by the new strategy of using disposable cell phones, finishing their pre-paid minutes before a wiretap can be approved.

[3] He masterminds a scheme wherein he goes undercover as a con artist selling illegally recharged (and wiretapped) disposable phones to Bernard, a Barksdale soldier that Bubbles is acquainted with.

Meanwhile, he continues to follow the Barksdale money trail, subpoenaing the financial records of State Senator Clay Davis and property developer Andy Krawczyk.

Freamon wrongly believes that Mayor Clarence Royce would not risk interfering with a criminal investigation to help Davis and Krawczyk due to an upcoming election.

Freamon further observes that Stanfield is not tied to any murders since the Barksdale gang war ended, and begins to scour Baltimore for any trace of the bodies he knows must be hidden somewhere.

Herc unwittingly provides Freamon with a key clue in the form of a nail gun he noticed when he pulled over Chris Partlow and Snoop.

While checking abandoned row houses in that immediate area, Freamon notices that one of the doors was nailed in while the others were screwed shut, and realizes that Lex's body must be inside.

Bunk is outraged that McNulty is interfering with crime scenes and falsifying case notes as part of his plan, and enlists Freamon to talk sense into him.

Rupert Bond decides not to file the new charge, as passing the case over to federal prosecutors would cost him the opportunity to raise his political profile.

Freamon laments the loss of tracking Stanfield's money trail, but takes the retirement, makes peace with Greggs, and is last seen in the end-of-season montage putting together dollhouse furniture in the company of Shardene.