3x14 - Forever Knight

When a murder occurs in a haunted house, it looks like the murderer might just be ... a ghost. On top of the investigation, Nick, Natalie, and Tracy all encounter ghosts from their own past after being in the house. When another man is apparently killed by the hand of the ghostly murderer, Nick and Tracy suspect their ghost may not be so dead. While they hunt for the murderer, all of them are haunted and must find a way to come to terms with their own ghosts.