Frank Mankiewicz died Thursday, more than 45 years after the former press secretary announced the death of Robert F. Kennedy in 1968.
A family friend, Adam Clymer, says Mankiewicz died of a heart attack at George Washington University Hospital, The Associated Press reported.
Mankiewicz was a Democratic political operative, journalist, and author. He served as political director to Sen. George McGovern in his 1972 presidential campaign.
The son and nephew of filmmakers, Mankiewicz studied journalism and law and worked for newspapers in Washington, D.C., and Los Angeles. He assumed the role of President John F. Kennedy's Peace Corps director in Lima, Peru, in 1962 and later was a regional director in Washington.
In 1966, Mankiewicz became press secretary to Democratic Sen. Robert Kennedy of New York. Kennedy was assassinated in Los Angeles in June 1968.