Lonely Hearts (2006)

Ray Fernandez is a slick charmer who cons lonely women out of their savings. Then he meets Martha Beck, a woman of similar morals and modus operandi, and they're perfect for each other. But he continues to seduce women out of their saving, and Martha gets jealous. Dangerously jealous: the result is a series of murders across several states. On their trail is a pair of jaded, yet experienced and resourceful police detectives.