FILE - In this May 12, 2008, file photo, Marie Tippit, the widow of former Dallas Police Officer J.D. Marie Tippit who was devoted to helping others, and spent her life focused on God and her family, has died at age 92. (AP Photo/Lauren Victoria Burke, File)DALLAS – Marie Tippit, the widow of the Dallas police officer killed by Lee Harvey Oswald about 45 minutes after the assassination of President John F. Kennedy, has died. Marie Tippit told The Associated Press in 2013 that it was “just remarkable that I kept going" after her husband’s death. In 2013, Marie Tippit spoke about a letter she received shortly after her husband's death from another young widow, Jacqueline Kennedy.