The Untouchables — Ending Explained

The film's third act is a cascade of tragedy and vengeance. Jim Malone is murdered in his apartment by Capone's enforcer, Frank Nitti, but manages to crawl to give Ness the key to the case before dying. Oscar Wallace is also killed in an elevator ambush, his blood writing 'TOUCHABLE' on the wall. In the climax, Ness confronts Nitti on the courthouse roof. When Nitti gloats about killing Malone, Ness pushes him off the roof to his death—an act of pure vengeance, not law enforcement. Ultimately, Capone is convicted not for murder, but for tax evasion, thanks to Wallace's earlier discovery. Ness leaves the force, handing his badge to the rookie Stone.

Critics often interpret the film as a Western in urban drag. The plot follows classic Western beats: a lawman arrives in a lawless town, recruits a posse (the deputy, the old timer, the rookie), and engages in a shootout at the 'corral' (the border/courthouse). Another reading focuses on the Corruption of the Hero: Ness does not win by being better than Capone; he wins by becoming him—using illegal wiretaps, coercion, and vigilante justice (killing Nitti). The ending suggests that while the battle was won, Ness's moral innocence was the casualty.