Trachtenberg’s death at 39 is not being treated as suspicious and police said a medical examiner will determine the cause of her death.

Georgina was played by the actress Michelle Trachtenberg, who was found dead at 39 in her Manhattan apartment on Wednesday. Her performance as the teenage supervillain brought an arch flair to a character who was only a minor figure in the novels that were the basis for the show, but became a fan favorite onscreen.

Actress Michelle Trachtenberg, famed for her roles in 'Buffy the Vampire Slayer' and 'Gossip Girl', has passed away at 39. Found unresponsive in her Manhattan apartment, she had recently been undergoing a liver transplant.

The longtime actress, who passed away at 39, underwent a liver transplant before her death. Learn more about her health and the challenges she endured.

Following news reports that the former child actor had recently undergone a liver transplant, top U.S. health experts explain what conditions cause the largest organ in the body to fail.

Melissa Gilbert, who starred with Trachtenberg in A Holiday for Love and lives nearby the actress, also took to Instagram, writing, "Oh Michy…and we lived so close to one another…..my heart aches for your family and all those who loved you so… @michelletrachtenberg #ripsweetgirl."