What mental illness does Cooper have in the movie Trap?

In M. Night Shyamalan's psychological thriller Trap, the character Cooper—played by Josh Hartnett—does not receive a formal, explicit clinical medical diagnosis within the dialogue of the film, but his behavior and psychological profile strongly align with antisocial personality disorder or psychopathy. Cooper exhibits hallmark traits associated with these conditions, including a chilling lack of empathy, profound narcissism, compulsive deceit, meticulous planning, and a compartmentalized double life where he acts as a devoted suburban father while simultaneously operating as a sadistic serial killer known as "The Butcher." The film explores his distorted cognitive processes, emotional detachment, and chilling rationalizations rather than pinning his actions on a specific textbook psychiatric illness.