Conversation so far:
When did Weeb Ewbank retire?
Weeb Ewbank retired after the 1973 season and settled in Oxford, Ohio.
Where did Weeb Ewbank go once he retired?
Weeb Ewbank settled in Oxford, Ohio.
Was Weeb Ewbank honored for his career?
Weeb Ewbank was inducted into the Pro Football Hall of Fame in 1978.
How did Weeb Ewbank feel about retirement?
Weeb Ewbank was inducted into the Pro Football Hall of Fame in 1978, but said later that year that he was glad to be out of coaching.
Did Weeb Ewbank have any hobbies in retirement?
Did Weeb Ewbank have a family?
Weeb Ewbank had a wife and three daughters.
What is a highlight of Weeb Ewbank's career?
Ewbank is the only man to coach two professional football teams to championships, and the only man to win the NFL championship, the AFL championship and a Super Bowl.
What teams did Weeb Ewbank coach for?
Weeb Ewbank has coached teams such as Cleveland Browns, Baltimore Colts, New York Jets.
What did Weeb Ewbank do in retirement?
Weeb Ewbank moved back to Oxford in retirement and wrote a book in 1977 called Football Greats.
Did Weeb Ewbank die?
Weeb Ewbank died at 91 on November 17, 1998, the 30th anniversary of the Heidi Game, after suffering from heart problems.

Question: From what cause?
Self-contained rewrite: From what cause did Weeb Ewbank die?