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Rosie O'Donnell remembers Harriet the Spy costar Michelle Trachtenberg, says she 'struggled' prior to death

Rosie O'Donnell is reacting to the 'heartbreaking' death of her 'Harriet the Spy' costar Michelle Trachtenberg, noting that she 'struggled the last few years.'

Trachtenberg was found unconscious and unresponsive in her New York City apartment just after 8 a.m. Wednesday, when police and emergency medical workers responded to a 911 call. After Harriet, Trachtenberg went on to play notable roles on Buffy the Vampire Slayer, as little sister Dawn Summers, and Gossip Girl, as chaos agent Georgina Sparks. Gossip Girl alum Ed Westwick wrote on social media that he was "so sad to hear" of her passing, adding that he was "sending prayers."

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