According to a 2003 piece in The New York Times, Hepburn had a "progressive yet treatable neurological disorder called essential tremor." Her ailment, which used to be called palsy, was inherited.
Kathryn Hepburn died of natural causes at the age of 96.
None. She died at 96 of natural causes.
Parkinson's Disease
Katharine Bushnell died in 1946.
Katharine Coman died in 1915.
Katharine Budd died in 1951.
Katharine Scherman died in 2009.
Bodil Katharine Biørn died in 1960.
Katharine Brettargh died in 1601.
Katharine Way died in 1995.
Katharine Goodson died in 1958.
Katharine Glasier died in 1950.
Katharine Furse died in 1952.
Katharine Parker died in 1971.
Katharine Mortimer died in 2003.
Katharine Jones died in 1967.
Katharine Purvis died in 1909.
Katharine Felton died in 1940.
Katharine Carl died in 1938.
Katharine of Habsburg died in 1280.