When Becky Bliefnick failed to pick up her boys from school, a family member went to check and found her dead in the living room. Detectives found a major clue in an unlikely place–on an episode of the game show "Family Feud."

The middle-aged couple were on a routine evening stroll with their dog when a man attacked out of nowhere, injuring the wife and fatally shooting her husband. What was behind the mystery attack?