Nicholas Brendon, Alyson Hannigan, Charisma Carpenter, and others also paid tribute to their former costar after her tragic passing on Feb. 26.

News of Michelle Trachtenberg's death prompted tributes from her friends and former "Buffy," "Harriet the Spy," and "Gossip Girl" costars.

Members of the 'Buffy The Vampire Slayer' cast have paid tribute to "little sister" Michelle Trachtenberg after her death aged 39.

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.

The Oscars in memoriam tribute, meant to honor names in film lost over the past year, skipped Michelle Trachtenberg and several others Sunday night.

Sarah Michelle Gellar has shared a heartbreaking message following the death of her Buffy the Vampire Slayer co-star Michelle Trachtenberg, who played her on-screen sister

Sarah Michelle Gellar is looking back on the memories she shared with her former Buffy the Vampire Slayer co-star Michelle Trachtenberg, both on and off-screen. Just a day after Trachtenberg’s passing in New York City,

Michelle Trachtenberg's Buffy the Vampire Slayer costar Sarah Michelle Gellar has paid tribute to the actress following her death at the age of 39

Michelle Trachtenberg was left out of the in memoriam segment of the Academy Awards just days after her shocking death -- and, fans aren't happy about it.

Michelle Trachtenberg, 39, was planning to attend a private benefit screening of the movie Spyral during the annual SXSW film festival in Austin, Texas, on March 12, it has emerged