Killer in Plain Sight S02 E20 The Barefoot Killer

"One killer... Multiple suspects... But nothing is what it seems."

When Carolyn Krizan-Wilson claims a barefooted burglar assaulted her and shot her husband Roy McCaleb to death, police spend years trying to track down the mysterious killer. It's only with the onset of dementia that Carolyn finally reveals the missing clue. [also shown as S1:E42]