The actress, best known for her roles in "Gossip Girl," "Buffy the Vampire Slayer," and "EuroTrip," was found dead Wednesday at the age of 39.

The cause and manner of Michelle Trachtenberg's death are undetermined, according to the New York City Office of the Chief Medical Examiner.

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

Trachtenberg referred to the British princess as "my girl E" and a "wonderful human" in Instagram posts through the years ...

Michelle Trachtenberg, known for roles in 'Harriet the Spy,' 'Buffy the Vampire Slayer,' and 'Gossip Girl', had undergone a ...

Michelle Trachtenberg's death has been ruled "undetermined". The 'Buffy the Vampire Slayer' star was found dead on Wednesday ...

While there is no criminality suspected, the city Medical Examiner couldn’t tell what caused the star’s death from a ...

Blair Waldorf? Serena van der Woodsen? Let's be real, the best Upper East Side mean girl was always Georgina Sparks on Gossip ...

Michelle Trachtenberg’s cause of death will remain undetermined after her family declined an autopsy. The 39-year-old actress was found dead in her New York City apartment by her mother on Wednesday, ...

The cause of death for Michelle Trachtenberg, the “Gossip Girl” and “Buffy the Vampire Slayer” star, will remain undetermined ...

Former cast members of “Buffy the Vampire Slayer,” “Gossip Girl” and more are remembering their co-star Michelle Trachtenberg ...

The late Michelle Trachtenberg was dating Jay Cohen at the time of death. Learn more about him below.