Possibly from uremia. The related link below will explain more.
King Charles II died of a stroke in February 6th 1685
He suffered a sudden apoplectic fit and as a result died February 6, 1685.
Charles II of Albret died in 1471.
Charles Phelps Taft II died in 1983.
Charles Comiskey II died on August 26, 2007, in Hinsdale, Illinois, USA.
Archduke Charles II of Austria died on July 10, 1590 at the age of 50.
Charles H. Price II died on 2012-01-12.
Charles II of Albret died in 1471.
Charles Christian II died in 1886.
Charles Ridgely II died in 1772.
Charles Phelps Taft II died in 1983.
Charles II of Naples died on 1309-05-05.
Charles Scribner II died on 1930-04-19.
Charles II of Navarre died on 1387-01-01.
Charles Harold Haden II died in 2004.
Charles Comiskey II died on August 26, 2007, in Hinsdale, Illinois, USA.
Archduke Charles II of Austria died on July 10, 1590 at the age of 50.
King Charles II of Spain died on November 1, 1700 at the age of 38.
Duke Charles Emmanuel II of Savoy died on June 12, 1675 at the age of 40.