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,

Michelle Trachtenberg was found in her New York City apartment, and the death is not believed to be suspicious, police said.