WHITE PLAINS, N.Y. - Dana Reeve, who won worldwide admiration for her devotion to her "Superman" husband, Christopher Reeve, through his decade of near-total paralysis, has died of lung cancer at the age of 44. Reeve, a singer-actress who gave up some of her own career to be one of the nation's best-known caregivers, died late Monday at Memorial Sloan-Kettering Medical Center, said Kathy Lewis, president of the Christopher Reeve Foundation.