Episode 113 of "Buffy, the Vampire Slayer"
s06e13 Dead things
Title: Dead things
Original Air Date: 02/05/2002 on UPN
Director: James A. Contner
Writer: Steven S. DeKnight
Guest Stars: Marion Calvert (Gina), Rock Reiser (Desk Sergeant), Bernard K. Addison (Cop #1), Eric Prescott (Cop #2)
Plot Outline:
The Troika's latest escapade to make Warren's ex-girlfriend Katrina their willing slave goes horribly wrong when she is accidentally killed. The trio use magical and demonic forces to make Buffy think that she has killed Katrina - and it works. With finding out the truth about her resurrection and believing she killed an innocent girl, Buffy's world begins to fall apart.