Michelle Trachtenberg, an actress best known for her roles in "Buffy the Vampire Slayer" and "Gossip Girl," has died at age ...

Michelle Trachtenberg (center) in a still from Gossip Girl (image via ... She quit the show to play the titular Harriet in her first credited film role in Harriet the Spy in 1996.

Michelle Trachtenberg, a 2000s mainstay with memorable roles in " Gossip Girl ," "Harriet the Spy" and " Buffy the Vampire Slayer ," has died at 39.