I am not going to accuse anyone for sure yet, but here are my suspects:

1. BRETT PARTRIDGE

-Fits all RJ characteistics. (Age questionable)
-Is in Jane's list of people he shook hands with.
-Has a "serial killer vibe " in my opinion
-He has a nearly identical voice to RJ
-According to another theory I've read, his opening line is "Red John enters here." (refering to a case, but that would still be clever)

2. ELLIS MARS

-Deceptive abilities (Psychic)
-"He is Mar" written on a wall, probably incomplete.
-In Jane's book (see Brett Partridge, line 2).
-Not very much background with Jane that we know of, lessening his chances of being RJ.

These are my main suspects. Again, I have not officially accused anyone, yet.

~Red John

First of all, I'm accusing CBI Ron, but I think that there's other possibilities.

So let me explain my new theory:

I'm not saying Bret Stiles, or Walter Mashburn or Virgil Minelli are not RJ, because lets think about some facts:

a) In season 2 finale, when the guy that we supposed to be RJ recites "The Tyger", you can clearly notice that's a young voice. Even if it's fake, try to imagine Virgil Minelly, Walter Mashburn, and Bret Stiles making that fake voice. Do you think it's one of them? I don't.. I think and I'm pretty sure that it's Brett Partridge.
Now,the thing is: We don't know for sure if the guy under the mask is RJ, or one of his puppets making the work for him. 
Also when Patrick talks to Red John in the limo, we don't know if the voice that we hear is really RJ, or only his puppet telling Patrick what red john tells him to say..
And this, and only this way, we can admit that Bret Stiles, or Walter or Virgil may be Red John. Because this way, Red John assures that nobody listens to his voice, not even his fake voice..

b) We also know that Red John haves Spanish/Mexican friends, because that guy whom Patrick takes out from prison is Mexican (talks the spanish language), and he says Red John is a friend of a friend of his. So we can assume RJ speaks the spanish language.
In season 2 finale, when Partridge comes to Patrick, we speaks spanish "que pasa dude?"....So, can Partridge be RJ, or one of his puppets, or none? We have to wait and see..

But, I think RJ is CBI Ron, (please read my 2 theorys about him)
Also CBI Ron only talks 1 time during the show and he haves a high pitched voice aswell. And he goes to the place where patrick, van pelt, cho etc are meeting in the office, and he says to Van Pelt that Olaughlin is on the phone (s03e08 I guess), and what can we suppose here? CBI Ron talked with olaughlin in the phone before he went calling Van Pelt, and we also know that Olaughlin worked for Red John...
CBI Ron also haves a wedding ring like Red John..

So I accused CBI Ron, even if I think that Brett Partridge is a strong candidate too, and Stiles, Walter and Virgil are good candidates too. But I think CBI Ron deserves more plausible theorys..


P.S.- We also know that RD is left handed (cause in Rosalind's house he drinks tea with his left hand. So PLEASE, stop making theorys about Patrick Jane being RJ and try to find something helpful like some characters in the show that are left handed.)

Sorry for the long post and thank you all for reading this.

I don't believe any solid identity can be linked to Red John. I am currently catching up (I'm at season 3 episode 12) but at the stage I am at I have reason to believe as of yet he has not been revealed yet. 

My personal opinion is that Partridge is involved and could be Red John's right hand man, the mole inside CBI. It may very well have been Partridge who saved Jane at the end of season 2.  But I do not think this is Red John.  

I will run through my thoughts so far and I appreciate anyone who wishes to speak about the subject to contact me on Jake.Muso@gmail.com.

1) CBI Ron : No, it's not Ron. Would have been interesting but Ron is too much a part of the back ground to be Red John. He seems genuinely not interested in Jane or the team and there would at least have been baleful glance in Patrick's direction at some stage just to annoy watchers into adding him as a suspect.  Accusing him is like accusing a chair on the set. He's part of the furniture.

2) Brett Stiles : I get the feeling that he is most definitely part of the Red John plot.  He basically admitted to it without admitting to it if you know what I mean.  BUT he is not Red John himself.

3) Lisbon, Van Pelt, Cho, Rigsby : In my opinion there is no chance of any one of them even being involved.  There were stages where I believed that Lisbon may be, but her latest behaveour rules her out of it for me.

4) Mashburn : I don't really know about him.  He is a wild card.  But in the end he brags a lot, and he is very annoyingly outspoken.  I wouldn't rule him out as a suspect just yet.

5) Patrick Jane : The notion of him being Red John fits the profile except for the fact that he and Red John are often in two very different places.  I don't see this happening ever.  

However I am trying to look through each and every character to see which person matches Jane in character and skill. Look out for sharp observations by someone other than him.  Because we know they are very alike.  They read the same poetry, they both drink tea, they like playing mind games to defeat their adversaries. Plus if you look at the poetry used i.e. Tyger Tyger.  This is written by William Blake.  In season 3 we see Patrick reading another poem by William Blake.  William Blake believed in Heaven and Hell reconciling and becoming one.  Almost like Yin Yang where the dark and light is one and the same.  Plus the poem speaks of 'fearful symmetry'. This says one of three things:
1) Symmetry as in one object divided into 2 parts which are the same : Making Patrick Jane Red John.
2) The same on one side as there is on the other : Almost like an evil twin somewhere of Jane.  Identical just very bad.
3) As in number 2 there is someone exactly like Jane running the Red John saga.  Someone with the exact same skills etc.  

Plus don't rule out his dad...

I accuse these people:

JJ LaRoche (alive and serving) (fat, no RJ)
Robert Kirkland (alive and serving) (too young not RJ)
Walter Mashburn (alive and serving) (candidate but not probable RJ)
Virgil Minelli (alive and serving) (it suits well the part)
Brett Partridge (alive and serving) (too young and creepy)
Gale Bertram (alive and serving) (too easy but yet it suits the part)
Lorelei Martins (alive and serving)(woman, not RJ)
Rebecca (dead)
Todd Johnson (dead)
Timothy Carter (dead)
Craig O'laughling (dead)
Madeline Higtower (alive? missing) (woman not RJ)
Orville Tanner (dead)
Dumar Tanner (dead)

Those are all Red John but of course there is one among them who is likely the "boss" a good looking not-to-young man. Why? Because his skills till now are far great than those of PJ and my theory is that's because RJ is older than PJ.
In conclusion if you look at RJ as some kind of mentor of PJs abilities then he can be both: Minelli or Bertram

But if you imagine the challange between PJ and RJ as equals then then obvious choice is Mashburn.
Well let's continue   :)

I accuse them of all of being Red John. 
It's not a single person. It's a group.

Timothy Carter said to PJ "I have many names, some calls me Red John".
Also he said "you're seeking a revenge you won't have".

PJ can't avenge because he is fighting a GROUP non a single person.

It's obvious that there's a mastermind who gave the idea: Brett Stiles.

More or less everybody (the males) fit Rosalind's description but I thik she is also in... because she loves RJ so it very likable she won't let him to be caught.

Supporting my theory ---> "He is mar\n" on the bathroom wall.

I believe is it part of the tense "He is many" or the "Mar\n" is the beginning of the name.
Usually when you address someone you start with the name not with the surname. You say Patrick Jane, Teresa Lisbon, not Jane Patrick or Lisbon Teresa, that's simply something we are all used to.

On the other hand I believe that Kristina Frye was the former RJ lover. Who as been left after been useful to his purpose.
To show Jane how deep RJ can control people and how hard he can still hit his feelings, even if he already took away everything PJ loved.

Kristina said "John won't hurt me, probably he is going to change" she is too sure that RJ won't hurt her.
But then she served the purpuse and RJ chose Lorelei as his new lover.

RJ is powerful but not that kind of power you imagine.
He knows how to control people minds and feelings, which allows him to be even a poor man but capable to use very powerful friends.
They prefer to die rather sell RJ.
That's his power. He maybe is even not in PJs list. And if it is then he is the less probable one.