Conversation so far:
How did Buck Owens die?
Buck Owens died in his sleep of an apparent heart attack on March 25, 2006, only hours after performing at his Crystal Palace restaurant, club and museum in Bakersfield
At what age did Buck Owens die?
Buck Owens died at 76
What happened after Buck Owens death?
In her 2007 authorized biography, Buck, historian Kathryn Burke gives a positive account of Buck Owens.
How did people mourn Buck Owens death?

Question: What health problems did he have?
Self-contained rewrite: What health problems did Buck Owens have?