“The Killer Downstairs” (*1/2 out of four) was a painfully predictable thriller about a disillusioned middle-aged woman (Cindy Busby) who rents her basement out to a recently divorced charmer (Marcus Rostner) and soon people in her life start getting murdered. Could there be more to this guy than meets the eye? Do we really need yet another retread of “Fatal Attraction”? Stale movie offers no surprises and thus no thrills or sparks.