I have always suspected Van Pelt since the start. My theories may be flimsy but just a few things I believe, Red hair for a start. In the pilot Van Pelt is introduced to Jane and shakes his hand, she also has a go at him around the dinner table showing a complete hate for him. Shooting her fiance is also intriguing, was he doing it for her? When pregnant in real life amanda righetti was kept in the show when other programmes would have written her out until she was ready to come back, I know she has now finally been written out with the story of her going on a course but it just seems weird? Like I say I've put this on as a little guess for fun but I have always suspected her. I wonder if I will be true. Is red john definately going to be revealed in season 5? I am a viewer in the uk so may be a bit behind you in america.