Michelle Trachtenberg, known for her roles in Buffy the Vampire Slayer and Gossip Girl, passed away on Wednesday. Authorities found her unconscious and unresponsive in her New York apartment. She was 39. Her sudden death has left friends, co-stars, and fans devastated.

Sarah Michelle Gellar’s Emotional Tribute

Sarah Michelle Gellar, her Buffy the Vampire Slayer co-star, shared a heartfelt message. “Michelle, listen to me. Listen. I love you. I will always love you. The hardest thing in this world, is to live in it. I will be brave. I will live… for you.”

Blake Lively Remembers Her Passion

Blake Lively, who starred with Trachtenberg in Gossip Girl, reflected on her dedication and bold spirit. “Everything she did, she did 200%,” she wrote. “She laughed the fullest at someone’s joke, she faced authority head-on when she felt something was wrong, she cared deeply about her work, she was proud to be a part of this community and industry as painful as it could be sometimes, she was fiercely loyal to her friends and brave for those she loved, she was big and bold and distinctly herself.”

Heartfelt Messages from Co-Stars

Kim Cattrall shared a brief but touching tribute. “Rest in peace sweet Michelle.”

Melissa Joan Hart also expressed her sorrow. “I’m heartbroken to hear of the passing of @michelletrachtenberg!! So young, so talented and so sweet!”

Taylor Momsen’s Deep Personal Loss

Taylor Momsen, another Gossip Girl co-star, shared how much Trachtenberg meant to her. “She was simply awesome. I’ll miss our late-night calls that no one should ever hear but us. She was always in my corner and there to support me whether I was right or wrong. I will miss you every day, my love… I think we truly understood each other and I am so grateful to have had a friend like you in my life for so long.”

Chace Crawford Reflects on Her Talent

Chace Crawford, also from Gossip Girl, remembered how she commanded attention on set. “Michelle was one of a kind. I remember her coming on set for the first time and just absolutely owning it. She was a force of nature and just so so unapologetically funny and magnetic… remembering those years with a big smile. Just a terrible loss. Love you.”

James Marsters Honors Her Intelligence and Humor

James Marsters, her Buffy co-star, described how special she was. “My heart is heavy today. We have lost a beautiful soul. Michelle was fiercely intelligent, howlingly funny, and a very talented person. She died much too young and leaves behind scores of people who knew and loved her. My heart goes out to her family who are good people and are suffering the greatest loss anyone could bear. I hope everyone can give them space to heal in this most difficult time. Godspeed Michelle. You are missed.”

Kate Beckinsale’s Final Goodbye

Kate Beckinsale expressed her grief with a heartfelt message. “What a terrible shock and loss, my god. My heart aches for your mama. Fly safe little bird.”