Michelle Trachtenberg, the actress who rose to fame as a child star with films like Harriet the Spy and went on to have memorable roles on TV shows including Buffy the Vampire Slayer and Gossip Girl, has died, according to an NYPD source.

Police responded to a 911 call on Wednesday just after 8am local time, and found a woman unconscious and unresponsive inside a Manhattan apartment. She was later identified as Trachtenberg, according to an NYPD spokesperson.

Actress Michelle Trachtenberg has died aged 39. (Michael Tran/AFP via Getty via CNN)

Paramedics responded to the location and pronounced the victim deceased.

“Criminality is not suspected,” the NYPD said in a statement, adding that the investigation remains ongoing. Trachtenberg’s official cause of death will come from the Medical Examiner’s office.

Earlier on Wednesday, an NYPD source told CNN that Trachtenberg reportedly had a recent medical issue and that her death appeared to be related to natural causes and not suspicious.

CNN has reached out to representatives for Trachtenberg for comment.

With her precocious demeanor and sharp comedic timing, Trachtenberg fit in naturally with the over-the-top humour that dominated Nickelodeon in the ’90s.

Stan, Buffy The Vampire Slayer, Michelle Trachtenberg
Trachtenberg in Buffy the Vampire Slayer. (Stan / 20th Television / Disney)

She first gained attention with a role on The Adventures of Pete & Pete and went on to star in Nickelodeon’s first feature film, 1996’s Harriet the Spy.

In the latter, she shared the screen with Rosie O’Donnell, young Gregory Smith and J Smith-Cameron, who would go on to star in Succession and played her mother in the project.

In 2000, she landed the role of Dawn Summers on The WB hit series Buffy the Vampire Slayer, playing Buffy’s (Sarah Michelle Gellar) polarising younger sister.

Michelle Trachtenberg, Georgina Sparks, Gossip Girl
She recently appeared in the Gossip Girl reboot. (Foxtel/Binge)

She remained with the series until its conclusion in 2003.

From there, Trachtenberg went on to several other high-profile TV appearances, playing Celeste on Six Feet Under and guest starring on shows including House, Law & Order: Criminal Intent (a callback to her first-ever screen credit on Law & Order in 1991) and Weeds.

She most recently appeared in two episodes of Max’s Gossip Girl revival.

Beloved actress Janet Andrewartha, who played Neighbours character Lyn Scully, has died.

Actress behind iconic Neighbours character Lyn Scully dies

It is unclear what she was working on at the time of her death, but she was active on social media. In the past week, she posted photos from her previous red carpets and reflected on the fashion.

“A memory, a magical night in #newyork. I remember feeling like Cinderella,” she wrote on one post roughly a week ago.

“Wishing everyone an ethereal weekend.”

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