Michelle Trachtenberg, the actress who gained fame as a child star in "Harriet the Spy" and later took on memorable roles in television series such as "Buffy the Vampire Slayer" and "Gossip Girl," has passed away at the age of 39. She was found deceased in her New York City apartment on Wednesday morning.

Authorities responded to a 911 call just after 8 a.m. local time and discovered Trachtenberg unconscious and unresponsive in her Manhattan residence. Emergency Medical Services pronounced her dead at the scene. The New York Police Department stated that no criminal activity is suspected, and the investigation is ongoing. The official cause of death will be determined by the Medical Examiner's office.

Reports indicate that Trachtenberg had recently undergone a liver transplant and may have been experiencing complications related to the procedure. In the weeks leading up to her death, she shared photos on social media reflecting on her past red carpet appearances, expressing nostalgia and gratitude.

Trachtenberg's career began in the 1990s with roles on Nickelodeon's "The Adventures of Pete & Pete" and the lead in the 1996 film "Harriet the Spy." She portrayed Dawn Summers, the younger sister of Buffy, in "Buffy the Vampire Slayer" from 2000 to 2003. Later, she took on the role of Georgina Sparks in "Gossip Girl," becoming a fan-favorite antagonist.

Her recent work included appearances in the "Gossip Girl" revival. Trachtenberg remained active on social media, engaging with fans and sharing insights into her life and career.

The entertainment community and fans worldwide mourn the loss of Michelle Trachtenberg, remembering her for her versatility, talent, and the lasting impact of her work on both television and film.