There have been several. I guess the most famous are:
Russian classical pianist Youri Egorov (1954-1988)
American classical pianist Paul Jacobs (1930-1983)
Liberace (1919-1987)
AIDS
Solomon - pianist - died in 1988.
William Murdoch - pianist - died in 1942.
Tony Jackson - pianist - died in 1921.
Frank Marshall - pianist - died in 1959.
Bill Miller - pianist - died in 2006.
John Browning - pianist - died in 2003.
Vladimir Belov - pianist - died in 1989.
Russ Freeman - pianist - died in 2002.
Harold Bradley - pianist - died in 1984.
John Bingham - pianist - died in 2003.
Chris Anderson - pianist - died in 2008.