Doesn´t this seem too familiar; 1. A serial killer who has been active for a long time...2. He leaves specific clues/symbols on the crime scene (RJ had the smiley, this one takes fingernails from his victims...)3. A "psychic" goes on television and talks about him as if he knew him, which angers him and he kills that "psychic" and his family (sister)...4. He is eager to show that the psychic is fake (remember RJ´s note on PJ´s door before he noticed his family´s bodies)5.  Red john is dead, and Lazarus means raised from the dead...
But given all of these clues, and soooo many given before them, I think that this series will end without the slightest mention of Red John.....Sad.