Maybe a little leftfield, but the actor who plays Ray Haffner was also in Bones last season and early this season as an FBI agent (typecast?). He was badly injured in a previous season, and suddenly appears in the recent episode (after recovering quickly), only to be killed by the main protagonist (Pelant) who is then quickly captured ... early to mid-season.

That whole multi-season plotline in Bones (around Pelant) was wrapped up very quickly, especially the Agent's death, and at the time the conspiracy theorist in me wondered if it was somehow related to the Mentalist.

Plus what everyone else has said ... '3 dot' suspects are too obvious, Stiles is too old, I assume Kirland and Partridge are actually dead.