Conversation so far:
What did J. Paul Getty do in his later years?
J. Paul Getty remained an inveterate hard worker, boasting at age 74 that he often worked 16 to 18 hours per day overseeing his operations across the world.
What type of operations did J. Paul Getty run?
J. Paul Getty was a British petrol-industrialist who founded Getty Oil.
What else did J. Paul Getty do during the later years besides remaining an inveterate hard worker?
J. Paul Getty's insatiable appetite for women and sex also continued well into his 80s. He used an experimental drug, H3
What did the experimental drug, H3, do for J. Paul Getty?
The experimental drug, H3, maintain J. Paul Getty's potency.
What year did J. Paul Getty die?
J. Paul Getty died on June 6, 1976.

Question: What did he die from?
Self-contained rewrite: What did J. Paul Getty die from?