Diagnosis: Murder Season 8 Episode 21 On the Beach - Deadly Mirage (2) ( Air Date 2001-05-04 ) Genre Drama, Family, Mystery category. Overview "While deeply disturbed that his son, Lt. Steve Sloan, is falling in love with a woman who is a dead ringer for his murdered former girlfriend, Dr. Mark Sloan begins watching his neighbors through binoculars and becomes convinced that one of them is a murderer.".