John C Fremont died of peritonitis, which is an inflammation of the peritoneum (the serous membrane that forms the lining of the abdominal cavity)
John C. Mandanici died in 1986.
John C. Cook died in 1920.
John C. Carr died in 1999.
John C. Corlette died in 1977.
E. C. John died in 2010.
John C. Kelton died in 1892.
John C. Watts died in 1971.
John C. Cochrane died in 1887.
John C. Swensen died in 1954.
John C. Heenan died in 1873.
John C. Sawhill died in 2000.
John C. Clifton died in 1841.