The actress was scheduled to appear at the South by Southwest Festival for a benefit screening of her documentary film “Spyral.”

Michelle Trachtenberg, an actress who starred in “Gossip Girl” and “Harriet the Spy,” was found dead in her luxury Midtown Manhattan apartment early Wednesday, police sources said. Trachtenberg, 39, was found unresponsive by her mother in her apartment near Columbus Circle at 8 a.m.

Actress Michelle Trachtenberg’s death was ruled “undetermined” Thursday morning after her family objected to an autopsy, according to a spokeswoman for the city medical examiner’s office and

Michelle Trachtenberg has died at the age of 39. Sources told The Post that the actress was found by her mother around 8 a.m. Wednesday at One Columbus Place, a luxury apartment complex in Manhattan.

Michelle Trachtenberg was excluded from the 2025 Oscars In Memoriam segment. The actress, who was found dead at her ritzy Manhattan apartment Wednesday morning at age 39, did not appear in the montage that honored the stars in film who died over the last year.

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

Michelle Trachtenberg, born on Oct. 11, 1985, was a Manhattan-born actress who started her career on Nickelodeon at only three years old. Trachtenberg went on to make a name for herself in movies

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

The cause of death for actress Michelle Trachtenberg has been ruled “undetermined” by the New York City Medical Examiner, according to an agency spokesperson.

Police officers, responding to a 911 call, found her unresponsive in a Manhattan apartment on Wednesday morning, the authorities said.

Michelle Trachtenberg was found in her New York City apartment, and the death is not believed to be suspicious, police said.

Michelle Trachtenberg, the actor best known for "Gossip Girl," "Ice Princess" and "Buffy the Vampire Slayer," died at age 39.