So after the last episode, we now know Jane has a suspect list of his own and some notes to go with it. And here it is! :

Brett Partridge
-CBI Forensics Department
-Totally MACABRE
-Handled RJ Cases

Ellis Mars
-Bumbling sort
-"PSYCHIC"
-Todd Johnson investigation

Dean Harken
-Agent
-Bio Tech facility
-Red Hair

Jason Cooper
-Second in command at Visualize. Stiles coup.

Walter Mashburn
-PLAYBOY!
-UNLIMITED $$
-Intrigued by murder

Vint Molinari
-CBI Missing persons
-Searched for Kristina F.
Made no progress

Virgil Minelli
-Old CBI BOSS
-Retired

DR. Towlen Morning
-Family Doctor
-Deceased?
-Early RJ victims

Osvaldo Ardiles
-D.A's office
-Road Block

After seeing this list, I now strongly believe Minelli is RJ. Reason why you say? Red Johns character changes through the show, almost as if he's looking for a new game to play. Virgil retires around the time Red Johns character changes. Also, when Alexa Shultz called him in the flashback episode and told him about Janes absence over that past year, she told him that he was in a mental asylum (motive and 'inspiration' to mess with him even more) and also that "Its good to have friends in the FBI". And we know RJ clearly has friends in the FBI.