Aaron Stampler is the main villain of the 1996 movie Primal Fear.
He was portrayed by actor Edward Norton.
He begins as an altar boy for the archbishop. After the archbishop forces Aaron into sexual activities, he brutally stabs him. Martin Vail gladly takes his case and sees him as a boy scout rather than a killer. Vail soon finds out Aaron has multiple personality disorder, which he and Aaron use to win the case.
Vail tells him the verdict is, he will stay at a mental hospital until he's cured. Then Stampler tells Vail to tell Venable, Vail's ex-lover and prosecutor of Aaron's case, that he apologizes for her neck because he attacked her earlier in court and then Vail asks if Aaron loses time then how does he know about her neck. Aaron reveals at the end that he's been faking it and manipulated them all and killed Linda and the archbishop for fun and of his own free will.