The killer in "The Little Things" is never definitively revealed, but the main suspect is Albert Sparma, a creepy, unstable man who fits the profile and exhibits strange behavior that makes the detectives suspicious. However, the film intentionally leaves the question ambiguous, focusing more on the detectives' psychological struggles than on solving the case conclusively. The protagonist, Jimmy Baxter, kills Sparma in a moment of rage without solid proof, and the story implies that the obsession with catching the killer might blur the lines of justice and truth. There is also a theory that Joe Deacon, one of the detectives, could be the real killer, but this is speculative and not confirmed by the film's narrative.
