Foyet appeared in Hotchner's hallucination in the Season 9 episode "Route 66" and then later to BAU Agent Spencer Reid in the series finale "And in the End...".

What episode do they catch the Boston reaper?

For Criminal Minds fans, one of the series' most iconic, heart wrenching episodes loses believability in this manner in one key scene. It comes at the climax of the Boston Reaper story, captured in the season five episode "100," when Aaron "Hotch" Hotchner's (Thomas Gibson) family is in danger.

What episode does Foyet attack Hotch?

In the season four finale, "... And Back", Foyet attacks Hotchner in the latter's apartment. Foyet stabs Hotchner nine times and tortures him with a knife before delivering him to the hospital.