Dahmer is a 2002 American
biopic horror film about the
American serial killer Jeffrey Dahmer.
Jeremy Renner stars in the title role. There are two timelines in the film: The "present" of the film runs in ordinary chronological order covering the period of one-to-two days; the flashbacks go in reverse order, so that Dahmer is seen as successively younger until the film arrives at his first murder and its aftermath.