Buffy The Vampire Slayer and Gossip Girl star Michelle Trachtenberg has died aged 39.
The New York police department confirmed her death to HELLO! in a statement on Wednesday. The police said they responded to an emergency call at around 8am on Wednesday to One Columbus Place in New York and Michelle was later confirmed dead after emergency medical services attended.
Her death is not being treated as suspicious and the police said the medical examiner will determine her cause of death.
The actress reportedly recently underwent a liver transplant.
Michelle was best known for playing Georgina Sparks on the CW TV show Gossip Girl, and for her role as Dawn Summers in the supernatural drama series, Buffy the Vampire Slayer, starring Sarah Michelle Gellar.
Tributes poured in on social media for the actress, who was born in New York on October 11, 1985.
Actor Ed Westwick, who played Chuck Bass in Gossip Girl, paid tribute to the actress on social media. Alongside a photo of Michelle dressed in character, Ed penned on his Instagram Story: "So sad to hear of the passing of Michelle Trachtenberg. Sending prayers."
Meanwhile, Buffy The Vampire Slayer actor David Boreanaz said he is "so very sad" as he paid tribute to Michelle Trachtenberg. Sharing a black and white photo of the actress on his Instagram Story, David wrote: "So very sad. Horrible news. RIP and prayers to her and her family."
Comedian Rosie O'Donnell, Michelle's Harriet The Spy co-star, said in a statement: "Heartbreaking. I loved her very much. She struggled the last few years. I wish I could have helped."
Taking to social media, one person wrote: "I'm shocked and devastated. I've been a huge fan of hers since I was a baby, and I was a huge defender of Dawn in the Buffy days. She was only 39," while another added: "Oh my God. Rest in peace. Michelle Trachtenberg was a wonderful actress. 39 is so young."
Michelle appeared in a number of TV shows and films over the course of her career, including Weeds, Love Bites, 17 Again and Criminal Minds. She began her career as a child actress and made her debut in 1991 on Law & Order. She landed her first major role aged nine on the Nickelodeon television series, The Adventures of Pete & Pete, in which she appeared from 1994 until 1996.
The actress also appeared in two episodes of the Gossip Girl reboot on Max in 2022, reprising her role of Georgina. During an interview with Deadline, creator Joshua Safran revealed that Michelle had pitched her character's return in the new show. "Michelle actually started DMing about it during the season one writers' room. She was like, 'I want to come back,'" he said in 2022.
Michelle won awards for her acting work, including a Young Artist Award for her role in Harriet the Spy in 1997 and another the following year for playing Maggie in the TV series Meego.
She was nominated for several awards over the years, including Choice TV villain for her role in Gossip Girl at the Teen Choice Awards in 2012 and a Daytime Emmy nomination for her role in Truth or Scare.