Since end of season 3 I thought Red John was Gale Bertram. Since the beginning of the show I wanted Red John to be Brett Patridge. However, it seems like Red John is Ray Haffner for the following reasons.
1) Reede Smith confessed that others have done murders in place of Red John. And I remember specifically in one episode Brett Patridge telling Patrick Jane that, "oh this is not Red John!" while investigating the scene of a murder with a smiley face. So since we are pretty sure that Brett Patridge was in the tiger tiger organization than it is safe to assume that even Brett Patridge might as well committed a murder for Red John. That is how he knew that murder was not commited by Red John because Brett Patridge himself commited that murder. I hope one of you remembers which episode that happened in!!
2)Bob Kirkland, or his twin, killed the guy that knew who was Red John at the end of the last season. I believe it was Bob Kirkland. He knew that his brother was in the Tiger Tiger organization so he asked that guy if he knew him, aka his brother, then after that he basically killed him off. He knew that guy was not Red John and he knew that he wouldn't give him any intelligence on Red John. And then Bob Kirkland was indeed killed by Reede Smith. I do not think his twin will show up because I believe he is dead too.
3)I am scratching off Thomas McAllister as well as Gale Bertram. Why? We already know that Red John literally called in murders to be carried out by the tiger tiger organization. So now, none of the people with the 3 dot tattoo could be Red John!
4) So now we are left with Ray Haffner and Bret Stiles! When Ray Haffner meets Lisbon; she tells him that they need Bret Stiles as well. So Ray Haffner sends Bret Stiles a note saying that Patrick Jane wants to see you, since we know that Ray Haffner has ties with visualize and knows the location of Bret Stiles. Then Ray Haffner comes up with a plan to fake his death as well as of Brett Stiles. We also see the blood ritual done by Brett Stiles. Red John possibly picked that up when he was at Visualize and turned it into a smiley face. We also know that at one of the Red John killings somebody wrote Heisman, possibly implying that he is a Heisman trophy winner. Also, Ray Haffner is indeed afraid of spiders! I believe that Brett Stiles is Ray Haffners father and Ray Haffner is the real Red John.
