Michelle Trachtenberg ’s final social media posts before her death were throwback photos from her Hollywood past. The actress, known for her work on Gossip Girl and Buffy The Vampire Slayer, was found unconscious in her New York City apartment on Wednesday, February 26, police sources confirmed to Us Weekly. She was 39.

Over the past month, Trachtenberg has posted a few photos on Instagram, including a few throwbacks. Her most recent selfie appears to have been uploaded on Wednesday, February 12.

Actress Michelle Trachtenberg’s death was ruled “undetermined” Thursday morning after her family objected to an autopsy, according to a spokeswoman for the city medical examiner’s office and

Several actors, including Blake Lively and Melissa Joan Hart, have paid tribute to Trachtenberg after she died on Wednesday.

Michelle Trachtenberg's death Wednesday left her former co-stars like Blake Lively, Rosie O'Donnell, Melissa Gilbert and Kenan Thompson shocked and saddened.

“Michelle comes off as genuine because she ... Melissa Gilbert, who starred with Trachtenberg in the 1996 film “A Holiday for Love,” wrote on Instagram: “My heart aches for your family and all those who loved you so.” Rosie O’Donnell, who ...