Still crying over a fictional character's death from a movie you saw years ago? Grieving a canceled-too-soon show? We are, too. So with "I'm Still Not Over...," EW staffers pay tribute to something in the pop culture world they're, well, still not over. Below, Samantha Highfill mourns the death of Marissa Cooper (Mischa Barton) on the 15th anniversary of The O.C. season 3 finale.