Trachtenberg, who co-starred with Gellar on the hit TV series, was found dead in her apartment on Tuesday. She was 39.

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

Sarah Michelle Gellar has paid tribute to her former Buffy The Vampire Slayer co-star Michelle Trachtenberg following her ...

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

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

Sarah Michelle Gellar, Taylor Momsen and Blake Lively are among those paying tribute to Michelle Trachtenberg, who died ...

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

Michelle Trachtenberg's former "Buffy the Vampire Slayer" costar Sarah Michelle Gellar is looking back at their time together ...

Sarah Michelle Gellar and other 'Buffy the Vampire' stars paid tribute to Michelle Trachtenberg, who tragically passed away ...

Many other celebrities and co-workers of Trachtenberg’s have written tributes after the actress’s death, including her Gossip Girl co-star Blake Lively. She shared a picture of the duo on set of the ...

Buffy 's Sarah Michelle Gellar has paid an emotional tribute to co-star Michelle Trachtenberg, who passed away at the age of 39. Gellar took to her Instagram to share pictures of her and Trachtenberg ...

Sarah Michelle Gellar is mourning the death of Michelle Trachtenberg, with whom she co-starred in “Buffy the Vampire Slayer.” “‘Michelle, listen to me. Listen. I love you. I will always ...