According to this,
http://www.independent.ie/woman/celeb-news/tunney-shocked-at-red-john-reveal-29707739.html

most probably there will be a 7th season :)

In the episode when PJ has a flashback, he and his father conned that woman with the sick girl. I believe that RJ has some connection to that girl. That might has sparked a grudge directed at PJ. It would also explain the attachment that RJ had to that blind woman.

I had this theory, that Chirstian Dos Santos was RJ, because he got the devil card in the episode where PJ first met the CBI, but Bruno Heller stated that RJ was on the list, so there goes my theory. Now I suspect McAllister to be RJ. He pretended to have a fear of heights to test if PJ had access to the info from Sophie. When PJ called him, he was right there, just behind him. He knew PJ needed help on the roof. He is the sheriff of a small town, who appeared the least among all the suspects. I bet all of my gummy-bears that he is RJ.

Hi guys!
There's something I don't understand..If Red John is really one of the seven, how come he is not doing anything and just lets Patrick closing in on him?
The real Red John that we know from the start wouldn't let this happen.
In the past he always killed everyone that was a risk to him, who could identify him. And he just sits around knowing that Patrick is down to 5 suspects and he is one of them?? It's just weird..

I know he is kind of fond of Patrick but surely he would kill him if he feels PJ is getting too close?? Obviously his own life is much more important to him than Patrick's life? 
I'm really starting to think RJ is NOT on the list and he is laughing about it all..

I only chose the sheriff because I would probably want him out of the 5 the most..

Look at this: http://1.bp.blogspot.com/-3vFaqH7WGwQ/TWRtbW-_88I/AAAAAAAAAbs/EqCq0_k0Y3Y/s1600/33.bmp

Looks sort of like Raymond Haffner from the back. The person that poisoned Rebecca at the CBI building. At the time, Haffner worked in CBI supposedly. 

I think it's Haffner because of these things:

- The silhouette on Keira Tinsley's door in the Red Tattoo showed a person with hair. You could even see smallish hair spikes all over the head. That eliminates Bertram immediately. 

- Did you see the action? Red John was quick to kill her and get out of there before cops arrived. He was sharp on his feet and deadly with his arms. Got the job done. Anyone really believe Brett Stiles is capable of this? Haffner has been shown to work out. Which leads me to the next point.

- "Something darker inside of him" - Sophie Miller. When she said that, at that very moment in the recording, they showed Haffner working out. That was the darkest trait of Red John that she described and Haffner was the one they showed at the time. Doesn't mean anything but it's a nice little thinker. 

- Sophie Miller met Red John in her office or home. There is no way in hell that she could come to the conclusion that he's scared of heights by looking  at the guy. Whereas it's quite easily possible that Red John was waiting in a room and showed anxiety when he saw a spider, she didn't know what his phobia was maybe because she couldn't see the spider, just see his fear. I mean offices and homes do have spiders right? Miller's house was not on a hill and the only elevation was like two steps in front of the door way. 

- Haffner has connections in the FBI, since he worked there. Remember Red John told Patrick he has a "friend in the FBI". It could be anyone, Alexa Shultz, Reede Smith, anyone in the FBI. 

- Haffner has connections in the CBI and it shows. He just used his connections in the CBI to get the autopsy reports in the latest episode before even Lisbon got it.

- Haffner has connections in Visualize. Which puts him in a good bet to have been on Elliston Farm in 1988. 

- He fits Red John's age description.

- He has hair.

- His body is slender, not fat and not too skinny. See here, Red John isn't Reede Smith by this body detail: http://www.youtube.com/watch?v=fgvXfZK9dnw&hd=1

- Haffner has the Lisbon connection and I'll make a theory about this later. 

- He can whistle.

- He's a private detective, meaning he employs himself now. He could have taken this job up to personally gather information on Tyger Tyger and get further away from Jane. 

- He walks identically to Red John. (There are clips for this too but they're already posted). 

- Ray = Jay = Roy, only slight alterations in name. 

- Can you possibly imagine Bertram or Smith trying to seduce people like Lorelei? Haffner can, so can Stiles but Stiles would use "awakening potential" through Visualize as an incentive to do it. Haffner can get people to do it through his functional likable looks and tamer personality. 

- Haffner is a genius in surveillance. Red John, ironically knows a lot of details about Jane and his team. Even basic everyday things, simple tiny events of their day. He seems to know about them. Also, remember that episode they introduced Rosalind Harker and Dumar/Sheriff Hardy? Patrick found wire taps and cameras in those twin teenage girls' room, Red John was responsible for killing one of the twins. It's possible he bugged their room. 

- Keira Tinsley was a private investigator, similarly to how Haffner is a private detective. She knew about his tattoo, he's so far the only one whose been shown to workout, quite possible she met him when he was out jogging, at the gym, or just a nice sunny day and he had a tank top on, it would be a normal thing in Sunny California, right?

- He's the only suspect that  shows subtle hints of jealousy towards Jane. 

- When Lisbon asks him if he was on Elliston Farm in 1988, he dodged her question and never answered it. Similar to how Red John never confirmed or denied being one of the 7 suspects. He left it vague, to let the other person figure it out. This is a personality characteristic that is consistent. 

- He meets all the physical descriptions. In this video, when you see Red John walking, he looks about Haffner's height and build (definitely not Smith's height or build, or Stiles' height): http://www.youtube.com/watch?v=ns_DWnqrEdI&hd=1

- McAllister, Smith, and Bertram were all in the CBI office "working together to take down a drug cartel (as stated by McAllister's "lots of narcotics in my neck of the woods"), when Jane walked in, they were discussing issuing warrants for arrests. Why would a local sheriff, a CBI director, and an FBI special agent be seen working together? Three difference levels of law enforcement and Smith's already come out as the first affiliate of Tyger Tyger, meaning the other two are in hot pursuit of the same. 

- Smith is FBI, he's federal and Bertram is CBI, state. Bertram is technically "below" Smith on hierarchy. Smith has a larger jurisdiction with his agency than Bertram does with his, which explains why Bertram was "taking orders" from Smith. 

- Both Smith and Bertram are poised to be in the episode "Red John". Do you guys think Bruno Heller is dumb enough to leave that information public to everyone? That if they were Red John that it would be as easy as looking at who stars in what episode to figure it out? They're both Tyger Tyger. I definitely think that's the episode Jane confirms who Red John is but I'm not sure if Red John has to be in that episode. It could be the big revelation episode. We know Bertram and definitely Smith are Tyger Tyger. 

- I think Stiles will be removed as a suspect in the next episode or two. The description of S6E6 says that he questions Stiles about Visualize and Red John, meaning we'll find out his involvement. I'm sure he's next to be removed since he seems to be the prominent suspect of the 5 for the next episode. The director did confirm by the start of the episode Red Dragon (S6E7) that the list will be down to 4 and I get the feel that the explosion in S6E6 is in the end of the episode. 

- We know how mobile Haffner can be now. He left the Sacramento CBI office "to get a better look at the hotel" in San Francisco like it was nothing. It's 80 miles, he's a private detective not a cop. Him going back and forth shows his mobility, something Red John has to have as a characteristic to be murdering people all over the California state map. 

- Also, watch that video I posted the link to earlier. I think Red John might be multi-dexterous. He was drinking tea with his left hand at Rosalind Harker's house and he shot that guy in the knee and those other two kids with his right hand. I don't know about you people but I'm right handed and doing things that need dominant dexterity with my left hand is very difficult. Haffner, if you paid attention to the show, shows subtle hints of multi-dexterity with his hands. He seems to be very good at using both, although I'm sure one of the hands are more dominant than the other. 

There's a lot of other small tidbits about Haffner that I could get into too but for now this will do. I definitely think he's Red John. 

Who is detective Oscar Cordero, first appearance in The Red Tatoo. He is played by Joe Nieves, and will also be in the next two episodes. I can't remember him from The Red Tatoo, and there is very little info about him online. Why is a seemingly minor character given a name and three (very crucial) episode appearances.