The cause of death for actress Michelle Trachtenberg has been ruled “undetermined” by the New York City Medical Examiner, according to an agency spokesperson.

Trachtenberg's co-stars in "Gossip Girl" shared similar sentiments. Blake Lively, who played Serena van der Woodsen in the series, wrote in an Instagram story that Trachtenberg "w

Michelle Trachtenberg, a former child star who appeared in the 1996 “Harriet the Spy” hit movie and went on to co-star in two buzzy millennial-era TV shows — “Buffy the Vampire Slayer” and “Gossip Girl” — has died.