Linus Wagner was present at the beginning of season 1.  He impersonated Red John to commit his murder.  Why didn’t RJ murder him or have him murdered by one of his followers?  RJ had the ability to get at his victims in all different types of circumstances and does not tolerate insults.  Jane went back to visit Wagner so we know he’s alive.  What’s their (RJ and LW) relationship and why is he still alive?  Probably not RJ, but why is he still alive?