I remember a move that was sort of similar in the vein of american psycho where a girl was following a serial killer trying to get evidence on him and toward the end of the movie they end up fighting which is when the police investigate her apartment and she has the cliche big board of where he has been going and what he has been doing so as a twist they wind up arresting her for stalking the killer and the killer goes free.
American Psycho II: All-American Girl (2002)?
The Bone Collecter?
American Psycho II: All-American Girl (2002)?
Definitely not. The girl wasn’t the killer she was stalking the actual killer.
The Bone Collector?
Pretty sure this isn’t it. Will watch it later to confirm.