[Her final outing was to Sartiano's restaurant
in SoHo last Thursday night.
An autopsy will be carried out by the
medical examiner's office to establish the
exact cause of death.
In the wake of her death, her former
Gossip Girl co-star Ed Westwick shared a
poignant throwback of the star on the show,
captioned: 'So sad to hear of the passing
of Michelle Trachtenberg, sending prayers.']
[Trachtenberg was best known for her work
as Buffy's ( Sarah Michelle Gellar ) younger sister
Dawn Summers in
Buffy the Vampire Slayer spanning 2000-2003]