Gellar is honoring her late 'Buffy the Vampire Slayer' costar, who died on Wednesday, February 26, with a powerful quote from the show.

Michelle Trachtenberg’s former “Buffy the Vampire Slayer” costar Sarah Michelle Gellar is looking back at their time together on screen and off, one day after Trachtenberg died in New York City.

Sarah Michelle Gellar was seen in public for the first time since the sudden death of her friend and Buffy the Vampire Slayer co-star Michelle Trachtenberg, who played her younger sister Dawn in the beloved series.

Sarah Michelle Gellar is paying tribute to her late "Buffy the Vampire Slayer" co-star Michelle Trachtenberg after her tragic death at age 39.

They’ll always be the Summers sisters. Sarah Michelle Gellar and Michelle Trachtenberg became close friends while playing Buffy and Dawn Summers, respectively, on “Buffy the Vampire Slayer” — a tight bond that lasted until Trachtenberg’s tragic death at age 39.

The news of Michelle Trachtenberg's death at age 39 remains a shock to those who watched her career flourish. Her death has also affected many who worked alongside her in some of her memorable roles.

Sarah Michelle Gellar, Taylor Momsen and Blake Lively are among those paying tribute to Michelle Trachtenberg, who died Wednesday. Trachtenberg was found in her New York apartment “unconscious and unresponsive,

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

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.

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. View Entire Post ›

Gellar's tribute to her late costar echoes a monologue she delivered in the supernatural drama's season 5 finale.

Sarah Michelle Gellar mourned the death of “Buffy the Vampire Slayer" co-star Michelle Trachtenberg in an Instagram post.