Trachtenberg, who was best known for her roles in TV shows Gossip Girl and Buffy the Vampire Slayer was found unconscious and unresponsive by her mother in her New York apartment in February.
Officials at the time said no foul play was suspected, and the medical examiner’s office had listed her death as “undetermined”.
It was further reported the actress has recently undergone a liver transplant having battled alcohol addiction and “may have been experiencing complications” from the surgery.
Trachtenberg’s family had objected to a post-mortem examination, which the medical examiner’s office honoured because there was no evidence of criminality.
Now, the New York City medical examiner has said she died as a result of complications from diabetes.
The office said in a statement that it amended the cause and manner of death following a review of laboratory test results.
Her representative did not immediately respond to an email seeking comment on Wednesday.
Former co-stars Sarah Michelle Gellar, Taylor Momsen, Ed Westwick, Blake Lively and Kim Catrall were among the celebrities who mourned Trachtenberg when her death on February 26 was announced.
Trachtenberg was just eight years old when she began playing Nona Mecklenberg on Nickelodeon’s The Adventures of Pete & Pete from 1994 to 1996 and then starred in the title role in the film adaptations of Harriet The Spy and Inspector Gadget, opposite Matthew Broderick.
In 2000, Trachtenberg joined the cast of popular supernatural drama Buffy the Vampire Slayer, playing Dawn Summers, the younger sister of the title character played by Gellar for 66 episodes from 2000-2003.
Trachtenberg went on to recurring roles on Six Feet Under, Weeds and Gossip Girl, where she played the gang’s scheming nemesis, Georgina Sparks. She was one of the original series’ stars to return for two guest appearances in the 2021 Gossip Girl revival.
Trachtenberg’s later credits included the 2004 teen sex comedy EuroTrip and 2009’s 17 Again with Zac Efron and Leslie Mann.
She was reportedly in talks to join the upcoming reboot of Buffy.
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