The Lodger (2009)

http://www.imdb.com/title/tt0851530/

The tale of a serial killer in West Hollywood has two converging plot lines. The first involves an uneasy relationship between a psychologically unstable landlady and her enigmatic lodger; the second is about a troubled detective engaged in a cat-and-mouse game with the elusive killer, who is imitating the crimes of Jack the Ripper.

please seed.