Upon arriving at the luxury apartment building, officers found a 39-year-old woman unconscious and unresponsive; EMS officials responded to the scene and found the actress dead. Gary Mantoosh,

Michelle Trachtenberg—the film and television actor known for roles in Buffy The Vampire Slayer, Gossip Girl, Harriet The Spy, and Ice Princess—had died. Her death was confirmed by ABC News. The outlet reports that she had undergone a liver transplant recently and is believed to have died from natural causes. She was 39.

Michelle Trachtenberg, the actress who rose to fame as a precocious child star in “Harriet the Spy” and went on to have memorable roles on TV shows including “Gossip Girl,” has died, according to the New York City police.