Actor Michelle Trachtenberg, known for her starring roles in Buffy the Vampire Slayer and Gossip Girl has died at the age of 39. Trachtenberg, who starred in a myriad of 90s and 2000s TV shows and movies,

Rosie O’Donnell, who starred alongside Trachtenberg in the starlet’s first movie, the Nickelodeon-produced 1996 film adaptation of the children’s novel “Harriet the Spy,” called the actress’ death “heartbreaking.”