Bob Kirkland.

In the E07 S05 - If It Bleeds, It Leads.

The episode ends with Bob Kirkland from Homeland Security talking to Lisbon and then greeting Jane in the corridor. The following conversation occurs: 
Bob: "oops, sorry Mr Jane."
Jane: "Do I know you?"
-HANDSHAKE-
Bob: "No... But I know you"
Scene ends with sinister music, high possibility it could be Red John, since Lora-Li escapes from Federal Prison in the next episodes.