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

Cast members of "Buffy the Vampire Slayer," "Gossip Girl" and more are remembering their co-star Michelle Trachtenberg​ after ...

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

Actor Sarah Michelle Gellar paid tribute to her “Buffy the Vampire Slayer” costar Michelle Trachtenberg on Thursday, a day ...

Michelle Trachtenberg’s former “Buffy the Vampire Slayer” costar Sarah Michelle Gellar is looking back at their time together ...

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

"The hardest thing in this world, is to live in it. I will be brave. I will live... for you," the actress shares after her co ...

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

When the series shifted from the WB to UPN for its sixth season, fans were treated to one of its most innovative episodes: ...

Buffy the Vampire Slayer star Sarah Michelle Gellar paid a heartfelt tribute to her co-star Michelle Trachtenberg amid her ...

Buffy The Vampire Slayer' star Sarah Michelle Gellar reportedly wanted Michelle Trachtenberg back as Dawn Summers in the ...

The NYPD confirmed to PEOPLE that Trachtenberg was found "unconscious and unresponsive" in her Manhattan apartment on ...