He made a surprising appearance on Weeds a few weeks back (below) and now Andy Milder is set to make an unusual appearance on Criminal Minds.

The actor will guest star on a fall episode of the CBS hit as a mentally-challenged character named Cy. Look for this man to play a key role in a BAU investigation that centers around a creepy thief.

In 2011, Milder has played roles on Parks and Recreation, The Middle and Bones. Not a shabby resume.

Criminal Minds returns for season seven on September 21 - and TV Fanatic will cover every episode of the drama with an extensive review.