Michelle Trachtenberg, best known for her roles in "Gossip Girl," "Buffy the Vampire Slayer," and "Harriet the Spy," has died. She was 39. Her death comes a year after she addressed online concerns about her health, saying she was "happy and healthy." More local videos here: https://youtube.com/@9news Subscribe to NEXT: https://youtube.com/@Nexton9NEWS Stay connected: 9NEWS Website: http://www.9news.com/ Facebook: https://www.facebook.com/ilike9news X: https://x.com/9NEWS Instagram: https://www.instagram.com/9newsdenver/ Download the 9NEWS App: https://www.9news.com/appredirect/ Sign up for the 9NEWSLETTER: https://www.9news.com/email 9NEWS (KUSA) is located in Denver, Colorado.