Michelle Trachtenberg, the actor known for her roles on Buffy the Vampire Slayer, Harriet the Spy and Gossip Girl, has died at age 39, The New York Post and ABC News confirmed Wednesday. 

Sources told the Post her death is not being investigated as suspicious.

HuffPost has reached out to Trachtenberg’s publicist for more information.

This is a developing story. Please check back for updates.

This article originally appeared on HuffPost.