“Lethal Love Letter” (*1/2 out of four) was a lethally derivative suspense thriller about a successful businesswoman (Clare Grant) whose life and career get turned upside down; could it possibly be the laughably sinister new hunk (Rick Malambri) who she recently met? Thoroughly obvious and predictable film made for those who’ve never heard of “Fatal Attraction” or its countless imitators. Lars Lindstrom’s attractive lighting and cinematography is one of the only virtues for this programmed timewaster.