Actress Michelle Trachtenberg, best known for roles in Buffy and Gossip Girl, dead at 39

Michelle Trachtenberg arrives at The Art Of Elysium Heaven Gala at Hangar 8 on Jan. 10, 2015 in Santa Monica.

Actress Michelle Trachtenberg, popular for her roles in buzzy millennial-era TV shows Buffy the Vampire Slayer and Gossip Girl, has died at the age of 39, New York City police confirmed to CBC News on Wednesday.