Right now, I chose SOMEONE ELSE, but only because we have multiple suspects, I think this week's episode, clearly made a statement of the suspects, the first page includes Partridge, Ellis Mars, Dean Harken, Jason Cooper and Walter Mashburn, it can't go beyond this 5. On the other page it has other names but for different reasons they don't seem to fit the profile of Red John (who is still alive, for example).

On the other hand, I am surprised that the guy from Homeland It's not on the list...he is the last one that we saw Patrick shake hand.

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 Tyger, Tyger, burning bright
In the forests of the night,

What immortal hand or eye

Could frame thy fearful symmetry?


 In what distant deeps or skies

Burnt the fire of thine eyes?

On what wings dare he aspire?

What the hand dare seize the fire?


 And what shoulder, & what art,

Could twist the sinews of thy heart?

And when thy heart began to beat,

What dread hand? & what dread feet?

 
What the hammer? what the chain?

In what furnace was thy brain?

What the anvil? what dread grasp

Dare its deadly terrors clasp?

 
 When the stars threw down their spears

And water'd heaven with their tears,

Did he smile his work to see?

Did he who made the Lamb make thee?


 Tyger, Tyger, burning bright

In the forests of the night,

What immortal hand or eye

Dare frame thy fearful symmetry?

☺ I blame; Keith Hunter Jesperson.
☺
☺
☺
☺
☺
☺ Signed : Rosey Johnny (-‿¬)
                      

Firstly, known facts:

- RJ is a white male. "Red Rover, Red Rover" (s04e23)

- RJ has shaken hands with Jane; they are known to each other, but are not friends. (s05e08)

- RJ's name possibly starts with "Ma". Note that there are three people who fit this criteria - namely, Madeleine Hightower, Lorelei Martins and Walter Mashburn. Out of these three, only Mashburn is plausible. (s01e11)

- RJ is "just under 6 feet tall; not muscular, but not soft either; short, straight hair; a gentle voice; rough, strong hands; he smelled of pine and nails and earth; and he liked to listen to me play the piano (especially Bach—he admired his rigour)." (s01e23)

- RJ has ties with Visualise. (s03e03)

- RJ has a fairly high pitched voice. (s02e23)

- It is still not clear what RJ meant when he recited 'The Tyger' (William Blake) to Jane. One might possibly deduce that it's an attempt to state that they are similar. Which is held up by recent episodes.

Mashburn - He's in a very good position to be a plausible suspect. He has the money, the power. He fits the descriptions to almost a tee. He is intellectual, narcissistic and above all competitive. It has been noted additionally that he has had several wives, the third -- he additionally states that "his third wife was in to all that goop" when talking about Jane's past as a psychic. No evidence thus far illustrates that RJ's third victim was a believer in the paranormal. From what we see, Mashburn's intellect does NOT level with that of Jane's.

Stiles - Again, in a very good position. It is stated that he was a friend of Ronald Reagan. He has illustrated both a strong knowledge of Jane and a connection with Red John. However, intellectually speaking, he has nothing on Jane. It is clear that Visualise is his first priority. However, it is acknowledged that Red John is adept at manipulating people, as is Bret Stiles.

J.J. LaRoche - It's a terrible shame that LaRoche isn't a plausible suspect, at all. His recitation of William Blake's 'Cradle Song' is such a tempting hint that he is at least an accomplice, of some sort, of Red John.

Luther Wainwright - Not only is he too small, he's too inexperienced. Also, he's dead.

CBI Ron - Seen walking alongside Kirkland on the way to Lisbon's office, and then seen to trail Kirkland as he leaves the CBI. Possibly a coincidence, but one might assume that he is, at least, an RJ informant. His name, of course, is a startling abbreviation of Red John, which, again, may or may not be a coincidence. No serious period of interaction occurs between Ron and Jane. This probably excludes him as a suspect.

Brett Partridge - A 'geek' by all accounts. It's clear that his understanding of Red John is limited. He does, however, suit most of the criteria. His position allows him infrequent, yet important interactions with Jane. His supposedly poor understanding of Red John COULD be a façade. Additionally, he illustrates the insecurities which Red John is shown to hold. His profile is suitable.

Out of the list provided, Mashburn is probably the strongest candidate. 

in episode 5X08 Loreli asked tells Jane why they didn't become best friends when they shook hands or somthing and then at the end when lisbon walks to janes room at a moment jane says and you din't tell any of your BEST FRIEND Kuckland either.
It just seems obviously he knows something more, more then he is telling. then he laughts... when Lisbon is not understanding what he is saying.

Una duda, para los que creen que Minelli es Rj, no se han fijado que Minelli es amante del cafe? No creen que sea un dato interesante? Yo he visto que pide siempre cafe? Entonces no creen que pudieramos descartarlo por ese hecho? Yo creo que Rj debe ser alguien jove, de 35-40 años y no debe ser gordito o llenito. De hecho el episodio donde mata RJ a Rebecca suponiendo que es el, checan que obvio no se ve a la perfección, pero se ve una persona digamos atletica, o delgada, estatura media y algo importante se le ve el cabello si estan pausando la toma cabello oscuro y minelli y  otros sospechosos lo tienen semi blanco - Otra cosa,en esa misma ese cuando esta apunto de caer Rebecca saquenme de la duda, se espera a ver el supuesto RJ? es que como que se ve una frente por ahi, perfecta la escena por que la tipa que va con ellos lo tapa ¬¬ pero se ve una frente chequenlo.. Asi que no se yo voy a que es Walter aunque tambien esta en duda por que ahi nadie del CBI lo conoce, o bien el famoso Ron CBI que no se si algun dia ha hablado o se ha saludad con Patrick Jane

everybody seems to have their own opinion as to who red john is...i have read many theories online....but here's something i haven't seen anybody talk about it....we have seen red john shoot somebody with his right hand like for example the 3 film makers...but when he visits rosalind we see him drink tea with his left hand.has anybody notice this?any theory?