Sarah Michelle Gellar leads tributes to Buffy co-star Nicholas Brendon Sarah Michelle Gellar has paid tribute to her Buffy the Vampire Slayer co-star Nicholas Brendon, following his shock death at the age of 54. 21 March 2026 Sarah Michelle Gellar has paid tribute to her Buffy the Vampire Slayer co-star Nicholas Brendon, following his sudden death. Sarah Michelle Gellar leads tributes to Buffy co-star Nicholas Brendon The 54-year-old star, who was known for his portrayal of Xander Harris in the supernatural horror TV series, passed away "in his sleep of natural causes" on Friday (20.03.