Trachtenberg's death shocked fans and saddened co-stars, who remembered the child star-turned-teen show favorite as big-hearted and hard-working in social media tributes following her death. While her rise to fame was fueled in part by television appearances,

The decision about which stars are included -- or excluded -- from the tribute at the Oscars comes down to time.

Gene Hackman, James Earl Jones, Maggie Smith, Gena Rowlands and Donald Sutherland were honored during the Oscars' In Memoriam segment Sunday night. Who else made the memorial list?