The Stepfather (2009) (Unrated)

Genre: Horror | Thriller
Starring: Dylan Walsh, Sela Ward, Penn Badgley

Plot: Michael returns home from military school to find his mother happily in love and living with her new boyfriend. As the two men get to know each other, he becomes more and more suspicious of the man who is always there with a helpful hand.

IMDB : http://www.imdb.com/title/tt0814335/
Wikipedia: http://en.wikipedia.org/wiki/The_Stepfather_(2009_film)