What presidents' wives died in the White House?

John Tyler's wife Letitia Christian Tyler, died in the White House on September 10, 1842,. (He remarried on June 26, 1844 while still in office. His second wife was Julia Gardiner Tyler.)

Benjamin Harrison's wife , Caroline Lavinia Scott Harrison, died from TB on October 25, 1892 while he was wrapping up his re-election campaign. ( He was remarried to Mary Scott Lord Dimmick, the niece of his first wife, on April 6,1896 after he had left office.)

Woodrow Wilson's wife, Ellen Louiise Axson, died in the White House on August 6, 1914 from Bright's disease. ( He was remarried to Edith Bolling Galt on December 18, 1915 while he was still in office.)