How do you remember the athletes who never got to finish their careers—from Roberto Clemente, who died helping earthquake survivors in Nicaragua after notching his 3,000th hit, to Hank Gathers, who collapsed on the court for Loyola Marymount, to Sean Taylor, murdered in the middle of an All-Pro season with the Washington Redskins? It's mourning on the playing field for stars who never got to say goodbye.