I dont think brett patridge is R.J. coz in S05 E08 Lorelei says to Patrick that he and R.J. shook hands...now Patrick and Brett never shook hands so i dont think he is R.J. although he qualifies verry well .....but still

Brett partridge is red john Because in s1.e01  &  s2.e23 he came in the crime scene why ???? because he want to see the murder’s he did’t do it and
why don’t he see crime scene that red john Committed its obvious he’s (rj)

sorry for my language 

Partridge matches the physical description both given to the CBI by a blind witness, and what we see in the episode where Red John saves Jane.

Partridge's voice matches Red John's voice.

Partridge pokes fun at Jane "whipping up the psychic ectoplasm" in the last episode Partridge appeared in, just as Red John did in the letter he left Jane after killing his family.

"The Tyger" is a poem by the famous William Blake, who also painted "A Brace of Partridge." The poem is either a reference to the fact that Red John is the Tyger and Jane is "The Lamb" (The Tyger's sister poem), or the fact that both Red John and Jane could in fact be the Tyger.

In the most recent episode, "Black Cherry" we see Jane's notebook of those he'd shaken hands with. The last page shown on screen has Brett Partridge listed on the left side with the following caption:

BRETT PARTRIDGE
CBI Forensics Dept
Totally Macabre
Worked on RJ cases


Lorelei Martins confirms that Jane has shaken hands with Red John, and Partridge being entered in this notebook confirms they had shaken hands.


With all of this evidence, it is pretty clear that Brett Partridge is indeed Red John.

look at episode 9 ..... min 42:23....first name written in the notebook is Brett Partridge

Alright, i think i know who red john is.
It's Brett Partridge.
First what we know about red john:
- He is just under 6 foot tall
-Oddly voice
-Very likely a man
-not too strong

Brett Partridge has an oddly voice, is just under six foot tall. Further he is the only one from the other characters who has a full name (unlike CBI Ron for example). He also is very macabre. Red John tells jane a poem by william blake: tyger tyger...
William Blake also made a painting called "a brace of partridges". you know what i mean.

It's so obviously partridge! He fits the requirements, and his voice matches red John's perfectly!

I think that brett partridge is RED JOHN because-
1)rj and brett have nearly same physical appearance according to the one told by the blind girl and the ,little girl on grave yard..
2)brett hates jane .
2)Match his voice with rj's voice in you tube through these links-https://www.youtube.com/watch?v=k26u5EOWWTUfor brett and this-http://www.youtube.com/watch?v=ns_DWnqrEdI for red john and you will see that they have nearly same soft voice..