Dawn Summers on 'Buffy the Vampire Slayer' was magical energy turned human. Michelle Trachtenberg made her everyone's kid sister.

Actress Michelle Trachtenberg was known for many famous roles, but only one was her true favorite. The star, who died at the age of 39 on Wednesday, February 26, played Dawn Summer, kid-sister of Buffy the Vampire Slayer's titular character,

Buffy the Vampire Slayer fans are mourning the heartbreaking death of Michelle Trachtenberg with a walk down memory lane. After the actress passed away at the age of 39 on Feb. 26, Buffy lovers are looking back on her iconic performance as Dawn Summers and planning rewatches of the series in her honor.