: 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.
The request most likely refers to the episode titled " Bully " (Season 9, Episode 11), which originally aired on December 11, 2013. Episode Overview [S9E11] Bully
: The episode explores Alex Blake's background , revealing tension with her father and her brother, Scott, a homicide detective who resents her involvement in the case. : The killer humiliates his victims—former students and
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 which originally aired on December 11