I've seen the promo for "The Red Tattoo" and i fear it will eliminate Ray Haffner as a suspect, he'll still be alive (he's in the episode after, so he's deffo still alive), but he won't be RJ. He'll probably be a member of the Tyger club, but not RJ, which is annoying because he's been my guy since the Red Barn.
My new suspect is based on an unusual theory. We're assuming it was RJ who "rescued" Michael Kirkland from alcoholism and despair, what if it was Bret Stiles, and Michael Kirkland is actually his apprentice, Red John.
Would be cruel irony that Bob Kirkland was killed trying to gain info on his twin, who he believes to be dead. And if Michael is RJ, i can see RJ being a touch pissed that the Tyger club killed his brother, and he'll probably seek to eliminate all members of the club.