Help with movie title?

I'm trying to find a movie that I only watched half of on late night t.v. and fell asleep on. I can only recall that it involved 2 criminals, male and female, who hid out in a house with a hostage and they didn't know he was a serial killer. The guy that played the serial killer looked familiar, but I can't recall what else he played in. I would like to watch the end of the movie, but I don't know the title so I can look it up. Does anyone know what movie this is? Thanks