Rosalind Harker

In the episode titled "Red John's Footsteps," season 1 episode 23, Red John knew that the CBI would trace the airplane and smiley face in the sky back to the suite 21 mailbox. I think Rosalind purposely put that letter to Roy to lead Patrick right to her. This way, she could tell Patrick whatever she wanted; she could manipulate him. Patrick would never question anything the blind girl has to say. I believe Roy Taglifero and his entire situation is completely made up by Rosalind.

In the same episode, Rosalind pours a cup of tea for Patrick and Lisbon. In the end of the episode, the same cup (with the same design) was still steaming in front of the television where Red John was watching Patrick.

Rosalind plays classical music, just like Patrick's daughter does in almost every flashback Patrick has.

She also has a smiley face on her wall from Red John. She knows Patrick will see it when she lets him into her room, but also knows Patrick will not ask her about it.

Lastly, every time Patrick gets close to finding Red John, Rosiland somehow shows up.

            In my opinion after much thought and observation I accuse Rosalind Harker, why? because truly I do not believe that she is blind, there is no proof. Let's see... Red john likes to play games right? and what better way to really throw off Jane then set up a "blind woman" to pose as the romantic interest of PJ's nemesis, after all he's charming to the women and can make them do pretty much anything. I believe the real RJ could easily have manipulated (maybe even brainwashed or hypnotised) this woman into thinking she is blind because he is clever and cunning and by doing this he could trick Patrick Jane into thinking she actually was visually impaired, thus appealing to his better nature (meaning RJ knows Jane is extra soft spoken and careful when interviewing and questioning people with impairments and disabilities. Truly I believe that Rosalind Harker is the rouse that RJ planned in order to completley throw Jane off his trail.

           Also I have another theory as to who Red John could be. I don't want to believe it, but our culprit could be right in front of our eyes, think about it who is always with Jane pretty much 24/7 and it's here job to keep him in line, yes I know you might hate me for sudjesting it although you could argue about her motive. Also I just had had a sudden thought that occured to me, I don't want to think it because I've always liked her, though wouldn't it be the ultimate  throw off for RJ's identity to be none other than our very own "badass, angry little,pocket rocket, cute as a button Agent Teresa Lisbon? this would explain setting Jane up to play with his emotions, I don't doubt that Lisbon is romantically interested in Patrick Jane, although could you imagine if it was all a plan and Jane fell in love with her only to find out she is Red John and that is why he couldn't "find" 'him" because she was right in front of his eyes. Also there is valid point in this next part, what better way to keep an eye on Jane than by working with him. Also if you think about it from a physchological pov. than wouldn't it be the ultimate rouse to have her as RJ, because no one would suspect the innocent Catholic cross bearing Teresa Lisbon right? also if you think about it from a theological perspective (in catechism) in the Bible it is said that Satan (the devil) likes to play and trick people into thinking he is what he's not, what better way to gain people's trust? I'm doubting this is the case, but wouldn't it be really cool if that was the way the series ended. I again doubt Bruno Heller thought about that one, although that would be awesome! (I should have created "The Mentalist" :)
or another interesting end Angela and Charlotte are behind it, and Jane kills his wife because the wife forced Charlotte doing her dirty work for her while she sat back and watched, so Charlotte was RJ and Jane was trying to catch his daughter! ........naaaaah, lol!

Also I don't want to believe it though patrick Jane could possibly have suffered a nervous mental brake down after his familie's death to the point where he actually went insane, and he's got a double life. (I'm not ruling him out yet because he's good for it! every scene adds up! the one I most analysed was when Jane was in the Hospital and they were pumping his stomach after he consumed Bella Donna in his tea (the hallusionation of his Daughter talking to him, I found it strange the way that she said to him "Does anyone know who you are?" almost like I know what you've done and I not happy about it, to which he replies "Yes.' then Charlotte asks "Who?" then Jane is quiet and then after a moment he says "Lisbon." then the flash back to Hospital starts and he is calling Lisbon's name.

You know personally i believe around season 4 Jane proved to himself that he know the true identity of Red John, now I just believe it's a matter of time and convincing the other's at the cbi that he actually figured it out.
I believe that he just setting the stage now for Red John (hopefully) to walk right into it, because given the information he has learned of RJ he is now baiting him to catch him, even though Red John and Jane are supposedly one in the same and very symmetrical, there is one part of the bigger picture no-one is seeing, Jane has to sneak up on RJ when he is most vulnerable and he needs the tools to do it, though they are both genius one will eventually outsmart the other, Jane knows the way he operates and excites things so it's just a matter of setting up the stage for what will hopefully be on of the best reveals in tv. History! RJ thinks Jane is completely off the mark, although really this whole time he's set the stage (the witnesses, the victims families etc.) there is most definatley a bigger part to the story and I believe since Jane started in the cbi from season one to now five he set things up for a reason in order to uncover the identity of the "monster serial killer" know simply to the audience as RED JOHN. 

I think Red John is Harker Rosalind.

In Season 4 Episode  2 Jane takes Rosalind to the morgue to identify Timothy Carter body.  Watch Rosalind and her body language, she seems as if she has seen a ghost and has the look on her face that the man on the morgue table is someone she loves.  Her body language suggests to me that she is deeply connected to the dead man (lover, brother, etc).

Timothy Carter and Harker Rosalind were extremely close together and loved each other.  Carter knew that Jane would not stop searching until Jane kills Red John.  Out of love for Rosalind, Carter pretends to be Red John and knows all Jane's secrets from Rosalind telling him, he fakes being Red John and Jane kills him.  Rosalind now has an opening to stop being Red John and for Jane to stop trying to kill her since Jane thinks he has killed Red John.  After she closes her mouth with the look of horor on her face, she says I don't know this person.  You can see the emotion change at the end of this episode where Rosalind's face goes from grief to anger and says, "I have never met this man." 

In Season 4 Episode 13 "Red is the New Black," Rosalind says Red John is at her home.  Rosalind kills the morgue attendant in anger and to show Jane.  If she has hightened senses from being blind she should know a dead body is in her closet and also show similar emotion from when she was so upset the day she itenditifed Timothy Carter's body in the morgue.  But she doesn't show emotion.

Lastly she has "red" hair. Jane always has is guard down around Rosalind  because he thinks she is blind and innocent. 

I think you guys are right or close. If you look at the episode where Jane goes to talk to the widow of the man he killed because he thought it was RJ. The widow looks just like her but different color of hair. They could be twins. They are probably sisters and that is why her husband knew all that information about Jane’s family and how they died.

The name "Rosalind" may come from rosa-blind. "Rosa" itself anyway means "red" in some languages. Her hair are also red, I don't know if all these are just coincidence. If Red John is somebody else why did he choose her, and what's the obsession with that colour?

I have a strong feeling that Rossalind Harker is Red John.... there is no proof of her being blind and Red John is clever enough to fool people even Patrick Jane. Infact blindness kind of gives her a cover she seeks. She must have made up the story of Roy Tagliaferro to misguide all. In the episode where the dead guard of the morgue is found in her house... she is seen playing the piano vigorously as if after some victory.... she seems calm and can fool people with her innocense and blindness... besides Red John is supposed to be calculative and good at mind games.......

I think it is the 'blind' red haired lady.
I don't think she's blind. maybe she has special contact lenses or something?
When they found the morc- guy murdered in her closet, come on, she (says she) is blind, but I think you can smell a dead person when it's in the same room as you are! and I also think that sheriff hardy (something like that)and rosalind where lovers, because he did bought a stuffed elephant for her, and he did spent thanksgiving with her. she wrote a letter to that roy guy, in the letter she says that she found the adress on a buisness card douwn the back of the sofa. So, or she is not blind, or roy's buisness card was in braille! when Patrick tells her RJ killed his wife and child she opens the door and says 'I'm so sorry.' and she tells him that Roy is such a friendly guy. (that's when PJ finds the red john's smiley face.) And when she says 'we all make mistakes, God knows.' she can't look at him, even though she's 'blind'.

P.S. I'm sorry for my bad English, I'm Dutch.