Mr. Brooks (2007)

"Mr. Brooks" is a psychological thriller that follows a successful businessman and loving father, Earl Brooks, who is also a notorious serial killer with an alter ego named Marshall. As Earl tries to control his urges to kill, he becomes entangled in a cat-and-mouse game with a tenacious detective, played by Demi Moore. The movie delves into the complex inner turmoil of Earl Brooks as he struggles to keep his dark secret hidden while battling his alter ego's desire to kill.