Conversation so far:
How did Walter O'Malley die?
Walter O'Malley died of congestive heart failure on August 9, 1979
Where did Walter O'Malley die?
Walter O'Malley died at Methodist Hospital in Rochester
Where was Walter O'Malley buried?
Walter O'Malley was buried at Holy Cross Cemetery in Culver City, California
Did Walter O'Malley have any children?
Walter O'Malley's children were Therese O'Malley Seidler and Peter O'Malley

Question: What did he do on the council?
Self-contained rewrite: What did Walter O'Malley do on the council?