Michelle Trachtenberg's cause of death was ruled "undetermined" by the Office of Chief Medical Examiner in New York City, Fox News Digital confirmed.

Michelle Trachtenberg’s former “Buffy the Vampire Slayer” costar Sarah Michelle Gellar is looking back at their time together on screen and off, one day after Trachtenberg died in New York City.

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

Michelle Trachtenberg's cause of death was revealed Thursday after the 39-year-old actress was found dead in New York City Wednesday morning.

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

Rosie O’Donnell paid tribute to her former co-star, Michelle Trachtenberg, who was found deadin her New York City apartment on Wednesday. “Heartbreaking,” O’Donnell said in a statement to Us Weekly. “I loved her very much.

Actress Michelle Trachtenberg has died at age 39. The beloved actress was found dead at her apartment in New York City on Wednesday, February 26. The New York Police Department confirmed to People that they responded to a 911 call at 1 Columbus Place around 8 a.

Academy Awards took place Sunday in Los Angeles, where the late movie stars were remembered by their grieving peers.

Police told the Post that Trachtenberg was found "unconscious and unresponsive" by police and was pronounced dead by EMS workers. Her death is not being treated as suspicious, police sources told the outlet,

Michelle Trachetenberg's cause and manner of death will remain undetermined after her family objected to having an autopsy conducted on her body.

Trachtenberg had a decades-long career, starring in a slew of iconic roles, including Dawn Summers on “Buffy the Vampire Slayer,” Georgina Sparks on “Gossip Girl,” and Casey Carlyle in the 2005 film “Ice Princess.” Most notably, perhaps, she starred in 1996’s “Harriet the Spy” alongside Rosie O’Donnell.