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 sources.

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

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.

Georgina was played by the actress Michelle Trachtenberg, who was found dead at 39 in her Manhattan apartment on Wednesday. Her performance as the teenage supervillain brought an arch flair to a character who was only a minor figure in the novels that were the basis for the show, but became a fan favorite onscreen.

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

Actress Michelle Trachtenberg, known for her role in "Gossip Girl," was found dead in a New York City luxury apartment building by the NYPD. She was 39.

Trachtenberg's mother found her in her apartment near Columbus Circle in New York City. No foul play is suspected, according to sources. Trachtenberg's " Buffy the Vampire Slayer " co-star James Marsters took to Instagram and paid tribute to the actress with a moving message and a photo of the both of them.