Fans and co-stars are mourning the loss of Michelle Trachtenberg, a millennial icon who starred in Buffy the Vampire Slayer .

Trachtenberg, who got her start as a child actor at the age of 3, was best known for her roles in the movie Harriet the Spy ...

"You were never grumpy," Sarah Michelle Gellar wrote to her former Buffy the Vampire Slayer onscreen boyfriend ... Cher Says Late Ex Val Kilmer Was 'Funny' and a 'Pain in the Ass' in Sweet Tribute ...