Zyzzyx Rd (2006)

IMDB
Genre : Crime, Drama, Thriller
TRAILER
Director : John Penney
Stars : Leo Grillo, Katherine Heigl, Tom Sizemore, Rickey Medlocke
Plot : Staid accountant Grant finds himself questioning his sanity after he begins a passionate affair with the enigmatic Marissa in Las Vegas and winds up killing her jealous boyfriend, Joey, when he attacks them. But is Joey really dead?