Instagram/Sarah Michelle Gellar & M Celebrity Sarah Michelle Gellar honors Michelle Trachtenberg on the anniversary of her passing, sharing heartfelt memories and photos of their 30-year friendship. March 15, 2026 AceShowbiz - Today marks the first anniversary of the passing of Michelle Trachtenberg, and her close friend and former co-star, Sarah Michelle Gellar, paid a heartfelt tribute to her on social media. On Instagram, Gellar shared a carousel of photos highlighting moments from their longstanding friendship. She wrote, "I'm not sure how it's been a year.