It has to be Bob Kirkland because in one of the episodes, he went to Teresa to tell her to stop following Volker. On the way back, he bumped into Jane saying, "Sorry Jane." Jane asked, "Do I know you?" Bob replied, "No, but I know you." Bob had a smirk on his face. They walked away. While Jane asked who he is, he was shaking hands with him. This was episode 5 of the fifth season, If it Bleeds, it Leads. In one of the episodes when Lorelei broke out of prison, she said that Jane shook hands with red john. Jane and Bob shook hands before the episode when Lorelei broke out which was episode 8 of the fifth season, Red Sails in the sunset. In the season five finale, Jane was down to 7 suspects. One of those was Bob Kirkland. He has to be Red John!
