Criminal Minds: Evolution has added four more ... Zach Gilford joins the dynamic cast as a recurring guest star in a season-long arc. CastA.J. Cook, Paget Brewster, Kirsten Vangsness, Zach Gilford ...

AJ Cook's character was an integral part of Criminal Minds, but for exactly one season (minus an additional guest appearance ... of any killer of the week. The cast would agree too.