Does anyone remember the episode where they show RJ holding a cup of tea with his left hand? If you zoom in on his hand you can clearly see what looks like a wedding ring.

Only two of the suspects wear a wedding ring: Gale and Tom.
Though Bertram doesn't strike me as a killer type persona, I'm still suspicious about him.

Guys, you guys are so stupid, or are on laxatives. Obviously it's one of the 5 left. If it so happens to be Brett Partridge, send me to the morgue: Everybody, everyone who found him dead, all the the doctors and morgue attendants must be his minions. All the CBI. Jane must be stupid too; I don't think he could be played that easily.

People saying it's Walter Mashburn: Come on, he was gone so far back! Just face it: He's not on the list! All those who are saying: Heller said Patrick would face Red John in the end of the 3rd season, but it was a fake, so Bruno is screwing us again.... Dumb! For one, CBS wouldn't approve. Second, he said it's one of the 5 remaining. In Lisbon's latest interview, she says... I was very surprised, I wasn't expecting to be that one on the list...

I have narrowed the list down to two suspects: Gale Bertram (Michael Gaston) and Reede Smith (Drew Powell) . I got those two by: WIKI ing all of the suspects. All of them (but two) 's final episode is either Fire and Brimstone (Bret Stiles and Sheriff McAllister and Ray Haffner). Only Reede Smith and Gale Bertram's last episode is Red John.

One of the two is RJ. Now let's make a list about the two.

Reede Smith could be a good RJ. He definitely has the tools (in more ways than one) and connections. It would make sense: that's how RJ knows about so much going on in the FBI. He has the personality: not afraid to kill, example Bob Kirkland. He is very antagonistic, and there is definitely much we don't know about him. But in the records of Janes old psychiatrist, she says that RJ is in good health. Reede Smith is so fat, I'm not sure that would be in good health. The writers had this in mind while they were writing the script. They wrote it after they revealed the final suspects. He hair would be like they said though: short and straight. According the Rosalind Harker, RJ is under 6 feet tall (in think so with Reede Smith) has a gentle voice (not sure about that) and not muscular but not soft, either. Smith isn't muscular, but definitely to soft.

Another thing: Ray Haffner is very muscular. Remember in the second episode of Season 6? It shows Haffner doing intense pull-ups. He is muscular, yet another way to rule him out. Bret Stiles is, I think, way to old to be killing and raping 31 women (so far). Sheriff McAllister seems like a likely candidate: seems like a perv to me, but also to old.

Gale Bertram is middle-aged, has short, straight hair, has the connections (it would explain his knowing what the CBI is up to, he is very high up on the rank, and even quoted a poem from William Blake in the episode Red Queen. Don't forget: William Blake wrote the infamous Tyger Tyger poem. I think I have also heard him whistling at times: again, Jane's psychiatrist said her patient was a very good whistler. He is probably a member of the Tyger Tyger conspiracy. Something from the WiKi:
Bertram R. Forer was a scientist that experimented The Barnum Effect for the first time (also known as Forer Effect), which is related to cold reading (the ability to gain information about someone without that person realizing that they are actually giving the information themselves) which is what Jane often does and a skill that Red John must be very good at. It might be a coincidence, but it can also be something that Bruno Heller wants the viewers to think about. In a previous interview Heller stated that Red John likes the cold, a statement that has been often interpreted for cold weather, but there is a possibility that cold in the sentence is related to cold reading instead.

But then again, also in the second episode of this season, it shows Sheriff McAllister whistling in his police car.

ANYWAYS, IT IS ONE OF THE TWO. I HAPPEN TO THINK IT IS.........

one of those two. I'm not sure.

I'm not acussing Bertram but i have to choose somebody...I don't understand the people who said accusing Partridge is stupid because Bruno Heller told us that he's dead...but they acussing mashburn or rigsby...Heller also told the list is real so I asume you people are stupid too?! Nobody is stupid they just try to say what they fell...And all we already saw a lot of crazy things in this show...I think the only person lying is Bruno because it's the best for the show...He also told us Patrick will face Red John on season 3 finale but he didn't...unless it was Bertram the only person patrick confront besides Carter...Hope you guys enjoy the show! And thanks for sharing!!

the picture of someone in the back of the police van appears to be Gale. 

He will be revealed as Red John. He might not fit the exact description of Rosalind Harker. That is the point, how can a blind woman tell the height of someone. Look at Bertram, he might have worn a wig to pretend he was someone else. He sounds creepy at times and he walked out from the mall in Season 3, because he knew Jane would find out the fake Red John. His hands and Haffner's hands are the ones that match Roy's when he visits her. One more interesting fact is that the actor who portrayed RJ when he visits Harker was none other than Jane.

Up until about 30 seconds ago I didn't think that RJ was anyone on the list.......Walter Mashburn was my guess...however....I've just watched a clip that replays the scene out of s6 e2 where Reed, Bertram and McAllister are in Bertram's office and Reed says 'exactly how much does Jane know' to which Bertram replies 'well that is the question isn't it'......Bertram sounds very very similar to Red Johns voice.....have a listen and let me know what you think!!

I don't know what to think now as before this there is no way I'd have thought it was him!

I believe that the list of 7 is correct, I really do think that PJ was able to remember all the people he had shaken hands with, and then narrowed that down further. That eliminates all people not on the list

Bob Kirkland - He's dead. It's hard to be Red John when you're dead. 

Bret Stiles - He's a maybe, but I think it's unlikely that someone who already has his nemesis, the ying to his yang (Red John has his nemesis of Patrick Jane) would start up a cult. From what I understand of Red John he wants to play games with PJ, he wants to torment him. He wants to keep him running in circles. As such, I don't think he'd start up a cult. I also think he's too old.

Reede Smith - I think Tyger Tyger organisation is distinct from Red John. Maybe there used to be a connection, but I don't think there is at this stage. I think that the organisation has taken up part of what they know of Red John (Tyger Tyger poem) and used it for their own, in a salute to him. I think that they respect him and want to emulate him, but are not him. It could be that he started it, or that he used to lead it or something, but I think that either they're separate completely, or he has now left, and separated himself. As such, as Reede is clearly a member of Tyger, he's not Red John. 

Brett Partridge - I think he's too young. If PJ lost his family in the 1990's then Red John has to be old. I find it highly unlikely anyone under 21 would have committed the murder of his family, I also think that it would have to be someone of at least 25, but most likely 30. That makes Red John, now, about 45, if not 50. Too old to be Brett Partridge. 

Ray Haffner - I think him too violent and emotional and rash to be Red John, a calculated and careful man. I think he's more likely to be muscle for Tyger Tyger, which as I said previously, I believe to be different to Red John. 

Thomas McAllister - We know that Red John is a learned and well spoken man. Two things that do not seem apparent of Sheriff McAllister. I know voices can be put on, but it would seem to me that his has too much of a regional dialect, and too many colloquialisms. I also don't think he has the devotion it would take to be as thorough and brutal as Red John.

So, in the words of Mr Holmes, when you have eliminated the impossible, whatever remains, however improbable, is the truth. That leaves Gale Bertram. 

I don't think by any means this is a concrete argument, but I think out of the 7 it's most likely to be Bertram. I wouldn't be at all surprised if it's someone completely unexpected, and not even mentioned in the top 15 in here. But, I have to say, I think Bertram is the most likely. 

First, some people seem to think there is a disconnect between Tiger Tiger and RJ..and they may even be in opposition to each other.  I don't think that makes sense, since RJ himself quoted the TT poem.  So I think RJ is head of TT.

Later, Bertram recites part of a different Blake poem, just out of the blue.  I also think he is just playing the semi-clueless paper pusher who can't handle PJ. 

Now some people who it isn't:

Partridge - faking his death would be too cliche
Cho, Rigsby, Lisbon - What sort of huge coincidence would it be that Jane stumbled upon the CBI team that happened to include RJ.