The early reports seem to suggest a heart attack. 60 is young , but it happens. Too bad. Great player.
theres a lot of literature on this subject, but just a quick squib from Web MD
African-Americans and Heart Failure
In a startling 2009 study published in the New England Journal of Medicine, researchers found that African-Americans have a much higher incidence of heart failure than other races, and it develops at younger ages. Heart failure means that the heart isn't able to pump blood as well as it should.