[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.

: The UnSub is a former high school student seeking revenge for a traumatic bullying incident from his past that led to the suicide of his best friend, Riley. [S9E11] Bully

: Ronald Underwood, the killer, was also a victim of the same bullies and blames the school's "useless" adults for only making the victims shake hands with their tormentors rather than taking real action. Summary Table: Criminal Minds S9E11 Title " Bully " Location Kansas City, Missouri Main UnSub Ronald Underwood Victims Former high school bullies and negligent faculty Character Focus Alex Blake and her family dynamics Other Potential Matches : The killer humiliates his victims—former students and

The request most likely refers to the episode titled " Bully " (Season 9, Episode 11), which originally aired on December 11, 2013. Episode Overview Summary Table: Criminal Minds S9E11 Title " Bully

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

: 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.