1887) May 12 – Giuseppe Bagnera, Italian mathematician (b. 1865) May 13 – Heinrich Peer, Austrian film actor (b. 1867) May 17 – Harold Geiger, American aviator (b. 1884) May 20 – John J. O'Connor, American Roman Catholic bishop and reverend (b. 1855) May 23 – Henry E. Huntington, American railroad magnate (b. 1850) May 25 Agustín Caloca Cortés, Mexican Roman Catholic layman and martyr (killed in action) (b. 1898) Henri Hubert, French archaeologist, sociologist (b. 1872) Cristóbal Magallanes Jara, Mexican Roman Catholic priest, martyr and saint (killed in battle) (b. 1869) May 28 – Boris Kustodiev, Soviet painter and designer (b. 1878) June 1 Lizzie Borden, American woman accused and acquitted of Parricide (b. 1860) J. B. Bury, Irish historian (b. 1861) Annibale Maria di Francia, Italian Roman Catholic priest and saint (b. 1851) June 3 – Princess Clotilde of Saxe-Coburg and Gotha (b. 1846) June 4 Julia Hurley, American actress (b. 1848) Robert McKim, American actor (b. 1886) June 6 – Robert C. Hilliard, American stage actor (b. 1857) June 7 František Dvořák, Czechoslovak painter (b. 1862) José Pedro Montero, 27th President of Paraguay (b. 1878) Pyotr Voykov, Bolshevik revolutionary and Soviet diplomat (assassinated) (b. 1888) June 9 Adolfo León Gómez, Colombian politician (b. 1857) Victoria Woodhull, American feminist, spiritualist and first woman to ever run for U.S. President (b. 1838) June 13 Abd Al-Rahman Al-Gillani, Iraqi politician, 1st Prime Minister of Iraq (b. 1841) Giuseppe Primoli, Italian collector and photographer (b. 1851) June 14 – Jerome K. Jerome, English writer (b. 1859) June 15 – Dashi-Dorzho Itigilov, Chinese Buddhist leader (b. 1852) June 20 – Clara Louise Burnham, American novelist (b. 1854) June 24 – Johann Büttikofer, Swiss zoologist (b. 1850) June 26 Armand Guillaumin, French painter and lithographer (b. 1841) José María Robles Hurtado, Mexican Roman Catholic priest, martyr and saint (b. 1888) June 27 – Sir James Macdonald, Scottish engineer and explorer (b. 1862) June 28 – Rafaél Manuel Almansa Riaño, Colombian Roman Catholic priest and venerable (b. 1840) June 29 – Ida Gerhardi, German painter (b. 1862) July–August July 1 – Pedro Nel Ospina Vázquez, Colombian general and political figure, 11th President of Colombia (b. 1858) July 2 – Joseph Gaudentius Anderson, American Roman Catholic bishop (b. 1869) July 5 – Albrecht Kossel, German physician, recipient of the Nobel Prize in Physiology or Medicine (b. 1853) July 6 Prince Friedrich Sigismund of Prussia (b.