News of Michelle Trachtenberg's death prompted tributes from her friends and former "Buffy," "Harriet the Spy," and "Gossip Girl" costars.

Actress Michelle Trachtenberg, whose career broke out in childhood with “Harriet the Spy” and went on to include “Buffy the Vampire Slayer” and “Gossip Girl” has been found dead in her Manhattan apartment,

Actress Michelle Trachtenberg, who rose to fame as a child star in the 1990s and 2000s, has died aged 39. Police in Manhattan said they responded to an emergency call on Wednesday morning and found Trachtenberg "unconscious and unresponsive". She was pronounced dead at the scene.