Actor Michelle Trachtenberg died of complications from diabetes, says NYC medical examiner.

The official cause of death for actress Michelle Trachtenberg, known for Gossip Girl and Buffy the Vampire Slayer, was revealed.

Sarah Michelle Gellar, who starred alongside Michelle Trachtenberg in the popular series "Buffy the Vampire Slayer," is heartbroken over her friend's death.

Actress Michelle Trachtenberg has died at the age of 39, police sources told The New York Post.