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.

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.

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.