From The Earth Is Weeping: The Epic Story of the Indian Wars for the American West, by Peter Cozzens (Knopf, 2016), Kindle Loc. 8022-8037:
Geronimo lived for twenty-three years after his surrender. In 1893, the government resettled Geronimo and the Chiricahuas—still prisoners of war—at Fort Sill, Oklahoma, home to the Kiowa-Comanche Reservation. They received plots of land to farm, and the men were taught the techniques of the range cattle industry. Geronimo went through something of a metamorphosis, becoming a model farmer and impressing his growing circle of white friends as a “kind old man.” He said he had learned much of the whites during his long years of captivity, finding them to be “a very kind and peaceful people.” In his later years, Geronimo also enjoyed celebrity. He appeared regularly at fairs and festivals, including the 1904 Louisiana Purchase Exposition in St. Louis, where at age seventy-five he joined in calf-roping contests and sold signed photographs of himself. In 1905, Geronimo rode in President Theodore Roosevelt’s inaugural parade and dictated his autobiography, which, over the army’s objection, was published with Roosevelt’s permission.
Although he never lost faith in his personal power, Geronimo embraced Christianity, more to supplement than to supplant traditional Apache beliefs. “Since my life as a prisoner has begun I have heard the teachings of the white man’s religion, and in many respects believe it to be better than the religion of my fathers. However, I have always prayed, and I believe that the Almighty has always protected me.”
Geronimo’s divine protection ran out on a cold day in February 1909, when he rode into Lawton, Oklahoma, alone to sell some bows and arrows. With the proceeds, the old shaman bought whiskey, for which he had never lost his fondness, and began the return ride after dark deeply intoxicated. He was almost home when he fell off his horse beside a creek. A neighbor found him the next morning, lying partially submerged in the freezing water. Four days later, at age seventy-nine, the man whom no bullet could ever kill died in bed of pneumonia.