Sarah Michelle Gellar’s tribute to Michelle Trachtenberg on Instagram references a fan-favorite moment from ‘Buffy the Vampire Slayer.’ The actress rewords a famous quote from the season 5 finale, ‘The Gift,’ in the wake of Michelle’s death at 39 years old. Sarah writes, ‘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.’ Michelle played younger sister, Dawn Summers, on the ’90s vampire drama’s final three seasons.