Michelle Trachtenberg dead at 39 — former ‘Gossip Girl,’ ‘Harriet the Spy’ star shared troubling posts

Actress Michelle Trachtenberg, known for a wide range of TV and film roles including in “Buffy the Vampire Slayer” and “Gossip Girl,” has died at the age of 39, sources told The Post.

Trachtenberg was found by her mother around 8 a.m. Wednesday at One Columbus Place, a 51-story luxury apartment complex in Manhattan’s Central Park South neighborhood, the sources said.

The actress recently underwent a liver transplant and died of natural causes, according to the sources.

The NYPD confirmed Trachtenberg was found “unconscious and unresponsive” by police and pronounced dead by EMS workers.Her death is not deemed suspicious and the city medical examiner will determine the cause, cops said.

Trachtenberg had posted a series of troubling photos in recent months on Instagram, where the award-winning actress has 800,000 followers, in which she appeared gaunt and frail, prompting some fans to comment about her startling weight loss or ask if she was on drugs.

Last January, Trachtenberg responded to fan concerns, saying she was “happy and healthy” and had never had plastic surgery.