I have read the following question:

How did Lorelei know that Red John and Patrick Jane shook hands? It seems improbable that Red John told her "I shook hands with Jane". More probable that she SAW this. But the first time Lorelei featured was when she and Jane met at the bar in the episode "The Crimson Hat" (I think). From that point onwards until she told Jane that he and Red John shook hands, was there anybody on the list that Patrick shook hands with, in her presence??

Possible Answer:

Please watch 1st Episode of Season 3: in this Episode Gale Bertram was introduced. In the background there is a woman, who's face is hiding behind a camera. You never see her face. It is the only person you don't see the face of. I think this was no coincidence, dear Bruno!! ;o)))  The woman looks like Lorelai (it could be Lorelai). After that Bertram and PJ shake hands. She could have seen it. But that means, Gale Bertram is RED JOHN.

Another theory:

Why a fake Red John at the end of season 3? Because PJ met the true Red John just before. Fake Red John to cover true Red John!!! That would also mean, that Bertram is RED JOHN. 

By the way, I don't like the idea of Bertram as Red John.

My favorites:

Brett Partridge or
Sheriff Thomas McAllister :o)))