Michelle Trachtenberg, an actress known for her roles in Gossip Girl, Buffy the Vampire Slayer, and Ice Princess, has passed away. She was 39 years old.

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According to ABC News, Trachtenberg passed away on February 26th in New York City. Sources told ABC News that Trachtenberg “recently underwent a liver transplant and may have been experiencing complications.” At this time, no foul play is suspected, and the actresses was believed to have died of natural causes. ABC News confirmed that the medical examiner’s office will conduct an autopsy to provide more details on the manner of death.