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Death and legacy

In 1934, Kanō stopped giving public exhibitions. The reason was his failing health, probably compounded by kidney stones. The British judoka Sarah Mayer wrote "People don’t seem to think he will live much longer" to his friends in London. Nevertheless, Kanō continued attending important Kodokan events such as kagami-biraki (New Years' ceremonies) whenever he could, and he continued participating in Olympics business.

In May 1938, Kanō died at sea, during a voyage that he made as member of the IOC on board the NYK Line motor ship Hikawa Maru. Because the Japanese merchant fleet of the 1930s used Tokyo time wherever it was in the world, the Japanese date of death was 4 May 1938 at about 5:33 am JST, whereas the international date of death was 3 May 1938 at 20:33 UTC. The cause of death was officially listed as pneumonia. but other sources list food poisoning as the cause of death. During the 1990s, there appeared allegations that Kanō was murdered by poisoning rather than dying of pneumonia. Although there is no known contemporary documentation to support this claim, Kanō's opposition to Japanese militarism was well-known, and many others who also opposed it were allegedly assassinated.

Judo did not die with Kanō. Instead, during the 1950s, judo clubs sprang up throughout the world, and in 1964, judo was introduced as an Olympic sport when Tokyo eventually hosted the 1964 Summer Olympics, and was reintroduced for good at the 1972 Summer Olympics. Kanō's posthumous reputation was therefore assured. Nonetheless, his true legacy was his idealism. As Kanō said in a speech given in 1934, "Nothing under the sun is greater than education. By educating one person and sending him into the society of his generation, we make a contribution extending a hundred generations to come."

Kanō has also been compared to the 9th Marquess of Queensberry in the way his legacy left a whole new set of rules:

Dr Kano’'s Kodokan rules for his version of jujitsu brought a new, safer kind of fighting to Japan in the same way that the Queensberry Rules, introduced some two decades earlier in 1867, did for boxing in England. Both the Marquess of Queensberry and Dr Kano transformed their sports, making them cleaner and safer. One man took the grappling out of boxing; the other took the boxing out of grappling. One worked with a padded fist; the other with a padded floor. In the latter years of the nineteenth century, the martial histories of eastern and western civilisation had reached a point at which two men at opposite ends of the globe produced, within a few years of each other, the rules which were to herald unarmed combat’s own age of enlightenment.