Question: What is the cause of death of Julie Nixon Eisenhower's mother?
Sentence (from "Julie Nixon Eisenhower"): Julie Nixon Eisenhower (born July 5, 1948) is an American author who is the younger daughter of Richard Nixon, 37th President of the United States, and Pat Nixon, First Lady of the United States, and is the wife of David Eisenhower, grandson of President Eisenhower.
Relevant evidence: Yes