Michelle Trachtenberg, known for her roles in Harriet the Spy and Buffy the Vampire Slayer, has passed away at the age of 39. Trachtenberg rose to fame for her breakout performance as Harriet in the Nickelodeon classic and captivated audiences with her portrayal of Dawn Summers on Buffy. She later appeared in the hit series Gossip Girl. She was reportedly found deceased in her New York City apartment by her mother on a Wednesday morning. Her work left a significant mark on television, touching the lives of many fans.