[s9e11] Bully -

: The killer humiliates his victims—former students and faculty members who failed to stop the bullying—by stripping them and dressing them in women's underwear before beating them to death.

If you were referring to a different show with a "Season 9, Episode 11" titled "Bully" or featuring a major bullying plot: "Frasier" Bully for Martin (TV Episode 2001) - IMDb [S9E11] Bully

In this episode, the Behavioral Analysis Unit (BAU) travels to after Alex Blake receives a call from her estranged father, a retired police captain. The case involves a series of brutal murders that Blake's father believes are connected, despite having no obvious surface ties. Key Plot Points : The killer humiliates his victims—former students and