I think that RJ could be the "underdog" Steve Mc Allister... He is a sheriff.
If you remember the episode called: RJ's friend's, Jared Renfrew, before dying, wrote something in the wall with is own blood. Something like: "he is mar.." 
So, how is also called a sheriff? MARshall....

Not sure if this has already been written off as a theory but from the most recent episodes it seems to me the most likely suspect would be Patrick Jane's father (Alex Jane). Partially, from the way everyone talks about how similar Patrick and Red John are, and the whole picking a memory straight out of Jane's head in the last episode. 

Originally I thought it was Brett Partridge as it seemed as though it was him who saved Jane when those kids took him captive, but now I think that would be far too likely. 

Looking at the murder timeline we can see there are 6 years between the death of Jane's family and another victim. If anyone has any clues as to what happened in those 6 years the suspect list could be narrowed down.....

It's possible that the names we saw in Jane's notebook eariler in the season were actually Jane's narrowed down list before he eliminated more and got it down to seven. That would be an interesting twist on Heller's part

Removing Morning because he didn't make the 30 suspects and he's dead gives us Partridge, Mars, Harken, Cooper, Mashburn, Molinari, Wagner, Minelli, & Ardiles. Wagner was in prison and has an alibi and Jane told Lisbon that Ardiles wasn't on the list.

That would leave

Partridge
Mars
Harken
Cooper
Mashburn
Molinari
Minelli

with the possibility of 1-2 of the names being different or replaced with other names . . .

If Jane had narrowed down his list as early as when we saw the notebook, than it left the rest of the season for Jane to orchestrate an elaborate con on RJ. Jane would've assumed that RJ would questioned Lorelei until she realized that she'd told Jane that RJ and Jane had shook hands at which point she would've told RJ. Jane knew that once RJ realized Jane was making a list, RJ would feel the need to steal the list. So Jane set up an elaborate con of pretending to spend all his time in the loft supposedably narrowing down his list. Jane got locks on the door, kept Lisbon and everyone else out, started acting very secretive, and avoided working on the team's murder cases. This would've acted like a radio broadcast to RJ that Jane was doing something important. Jane was planting a fake list for RJ to steal because Jane knows that RJ is far too careful to allow Jane to actually have a list with RJ's name. If RJ had seen the his name on the list, he would've killed Jane and the whole team just in case they'd seen the list. The game would've finally been too dangerous.

Now between the time Lorelei was caught by RJ and told him that Jane had a list and the few weeks before RJ killed Lorelei, RJ breaks in and steals Jane's list. Jane does not notice and continues with his charade of narrowing down the list. It was only when Kirkland's guys broke into the loft and left the toothpick on the ground that Jane finally believes his trap worked. After that episode, it only takes Jane two episodes to wrap up the farce of narrowing down the list because there's no longer a point as Jane believes RJ just stole the list. The season final showed that RJ had indeed fallen for Jane's fake list and that Jane was finally one step ahead of RJ even with the revelation that RJ had stolen Jane's list episodes earlier without Jane noticing at all. Just think about the past season finals. In the S3 final, RJ wins by tricking Jane into killing a fake RJ and almost getting O'Laughlin to kill Lisbon, Van Pelt, and HIghtower. Jane's plan was tricky but not good enough (the whole team & audience knew about the plan). In the S4 final it's a stalemate with Jane fooling RJ up until that last minute and RJ losing control of the situation resulting in Lorelei's capture (Jane does tell a soul except Lisbon, the audience had no idea it was a fake breakdown until then). It would only make logical sense that for the S5 final, Jane's plan is finally elaborate enough to completely fool RJ and Jane hasn't told Lisbon or the team and the audience has no idea.
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http://insidetv.ew.com/2013/05/06/mentalist-finale-season-6-red-john-list/

Please read this before posting your thoughts!

I have just realised something. The CBS mentalist site has an add for whoisredjohn.com. If you have not realised what this means here are 2 possible theories why Bruno Heller made the site.

Theory 1 - He has not chose the character that will be reaveled to be Red John. So this means that maybe he is using the theories of this site to decide who he is going to turn into RJ not making the most expected character and avoid disapointments.

Theory 2 - To engage the community into this exciting search and not let them forget and lose their excitement.

how do you guys know that RJ is even on the list of final seven, i mean its possible that jane has mistaken and erased him from the list. If Rj is on the list than my guesses are next : Kirkland isnt red john for sure because lorelei didnt know that patrick shook hands with him also when he murdured that guy in the hospital the guy didnt recognised him and we know that the guy knows who red john is so he would recognise him.


It would be stupid if Reede Smith is RJ , i dont believe its him.
The same goes for sherif McAllister. I think that RJ must have appeared in at least two episodes


The other 4 guys are all plausible.
Gale Bertram probably isnt because he is bald and the blind lady said that RJ has hair so i would dismiss him.

I think that Rj acts stupid so jane does not figure out his identity.
Ray Haffner was easily tricked so he is plausible.
brett stiles always acts smart and i have a feeling that he will help patrick catch RJ in the next season.
and we have partidge. he could be RJ, he also plays dumb (he didnt know that the killer in the first episode is copycat of RJ) and he annoys jane.


But i am still wondering what happened to that writing on the wall in mexico.
I thought that they would bring that up now when they have more clues about RJ.