Lela Undone(2007)

When Erin finds herself down and out on her luck, losing her job and her boyfriend in the same week, she decides to take in a renter, Nicole, to make ends meet. Before too long Nicole's bizarre copycat behavior grows from shy and innocent to scary as Erin unfolds Nicole's dark past filled with deceit and murder. Erin finds herself in a race against time to stop Nicole from killing the only man left that she loves in this edgy sexual thriller.