After last night's last episode, I think that it is clear to everyone that Agent Alexa Schultz from the FBI is Red John's accomplice in the police forces: she is the link between Red John and the forces. She is the key to this investigation. And the man who was sitting in front of her in the car (I identied Oscar Ardiles) could possibly be either Red John or more likely another accomplice of Red John; Bruno Heller would not give us an obvious sign of him. I think he wants to fool us, again.
Or, it could be Virgil Minelli, it is another likely theory.
Or, my other theory is that either these three are Red John at the same time, or they are three accomplices of Red John inside the police forces.

-TheFrenchMentalist.

I think the man in car with the agent who worked with red john looks like Bret Stiles .could he be his son? I mean perhaps its the reason why Bret knows about red John a lot becouse his son is red john?

From the latest episode its clear that Alexa Schultz is Red Johns FBI accomplice.

Was the man sitting opposite her, Red John? What do you guys think?

Saw online an interesting theory...someone suggested that Jane's brother in law, Danny, is Red John.  After listening to their voices, they sound very similar.  Do I find this likely?  Not really.  Possible?  Yes.  After seeing season 5 episode 5, I don't think it is Danny.  We clearly see the FBI agent who is working with Red John, then we see a man in the car, assumed to BE Red John.  We don't know this for a fact, but his voice was also similar. We only heard him speak two words though.  What do you all think?  

It's Warner Vanderhoke, Chief of Security for Visualize. James Morrison's role seemed too tangential and inconsequential for such a fine actor. He must surely make a reappearance.

I just posted this to ask people who think that Red John is Patrick Jane to consider the fact that Patrick has visited Red Johns blind girlfriend. If Patrick was indeed Red John the girlfriend would have known immediately.

I think Susan Darcy is Red Johns accomplice in the FBI.

I believe RJ is PJ's father. We have not seen him sinse season 1. I believe he is angry at his son for abandoning the family con business. That is why he kills people around PJ, but not PJ.
He loves PJ and admires him.