(CNN) -- George Smith, one of the Navajo code talkers who helped the U.S. military outfox the Japanese during World War II by sending messages in their obscure language, has died, the president of the Navajo Nation said.

"This news has saddened me," Ben Shelly, the Navajo president, said in a post Wednesday on his Facebook page. "Our Navajo code talkers have been real life heroes to generations of Navajo people."

Smith died Tuesday, Shelly said, and the Navajo Nation's flag is flying at half-staff until Sunday night to commemorate his life....