Sarah Michelle Gellar is paying tribute to her late Buffy the Vampire Slayer co-star Michelle Trachtenberg after her death at age 39. Gellar took to Instagram on Thursday to share photos of the pair together on Buffy and throughout their years of friendship.

Sarah Michelle Gellar is paying tribute to her late Buffy the Vampire Slayer co-star Michelle Trachtenberg after her death at age 39.Gellar took to Instagram on Thursday to share photos of the pair together on Buffy and throughout their years of friendship.

Actor Sarah Michelle Gellar paid tribute to her “Buffy the Vampire Slayer” costar Michelle Trachtenberg on Thursday, a day after police foung the 39-year-old dead in her New York City home.

Sarah Michelle Gellar took a walk down memory lane in honor of her late friend and co-star Michelle Trachtenberg.

Sarah Michelle Gellar paid tribute to the late Michelle Trachtenberg after the actress died at age 39.

Sarah Michelle Gellar and Michelle Trachtenberg starred in three seasons of "Buffy the Vampire Slayer" together and remained close following the end of the series.

Fans and friends alike are mourning the loss of Michelle Trachtenberg, who died this week at age 39. Sarah Michelle Gellar was among those sharing tributes to the actor, with whom she co-starred on Buffy The Vampire Slayer.

Several actors, including Blake Lively and Melissa Joan Hart, have paid tribute to Trachtenberg after she died on Wednesday.