Gossip Girl Michelle Trachtenberg | Actress Michelle Trachtenberg Dies At 39, Cause Of Death Unknown Michelle Trachtenberg, the actor known for roles in series including "Buffy the Vampire Slayer" and "Gossip Girl," has died, according to US media outlets. She was 39 years old. Police said officers responded to an emergency call just after 8:00 am local time (1300 GMT) on Wednesday, The New York Times said, where they found her in her Manhattan apartment unconscious and unresponsive. Emergency medical workers pronounced her dead without giving a cause. Police said foul play was not suspected. Citing anonymous sources, ABC News reported that the actor recently underwent a liver transplant, and was perhaps experiencing complications.