I accuse Patrick Jane's wife, Angela Ruskin Jane, as being Red John.  I believe she is still alive.  I will try and list my points in bullet format for simplicity.
1. There are no dates on the tombstones for Jane's wife and daughter.
2. When Jane visits the graves with his brother-in-law (Danny) in "Cackle-Bladder Blood" he says it is the first time he has been there since the funeral because "they are not really there."
3. Also when talking with Danny earlier in the episode he says about his wife "that was our thing, that's what we did, we escaped together."
4. Jane is a name that can be male or female, however the more common association is female.
5. An alternate name for "Patrick" is "Pink" and an alternate name fore "Jane" is "John" which together means "Pink John."
6. The name of Patrick's wife is Angela Ruskin Jane (Ruskin is the maiden name).  The meaning of the name "Ruskin" is "red haired."  Put the two together and you have "Red Haired John" or, "Red John."
7. This would explain the uncanny, almost obsessive relationship Red John and Patrick Jane have with each other.

Keep in mind both Patrick and Angela were "carnies" together and she must have been incredibly intelligent as well, how else could she win Patrick's heart.  And faking death's is something we've seen a few times throughout the series. And Red John being a woman could explain Red John's 'way with women.'

Thoughts?