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. Lettsome died in 1815.
John C. Raven died in 1970.
John C. Churchill died in 1905.
John C. Shumate died in 1992.
John C. Box died in 1941.
John C. Champion died in 1994.
John C. New died in 1906.
John C. Sherwin died in 1904.
John C. Kunkel died in 1970.
John C. Cook died in 1920.
John C. Houk died in 1923.
John C. Carr died in 1999.