Just saw a very interesting image from the extended promo for The Great Red Dragon.

Rigsby is informing someone about the incident at Jane's house (the explosion) and he says:

"Red John brought in the bomb to kill Jane and the other suspects."

While he is saying this...images of 3 of the suspects are pinned to the board: McAllister, Haffner, and Stiles. This insinuates that either all 3 of these men were killed in the blast and Bertram and Smith are the remaining suspects (unlikely) or Bertram and Smith were killed in the explosion and McAllister, Haffner, and Stiles are the remaining suspects (more likely.)

I still think it's Partridge, but just wanted to throw that info out there for you guys:)