That Fateful Day

In the happy town called Twinbrooke, lived a couple who loved each other so much. When Sarah and Colt were on there way to a fancy restaurant when they crashed. Colt dies and Sarah loses her memory and also does not remember why they crashed. After a while she remembers the whole accident. But who was the misty figure at the scene. Why was it there? What was it doing? When Sarah meets Dr Kyle she instantly falls for him. But even he could be the figure. Right?