Cause of death: heart attack
Sergio Leone ( lee-OH-nee, Italian: [ˈsɛrdʒo leˈoːne]; 3 January 1929 – 30 April 1989) was an Italian filmmaker, credited as the pioneer of the spaghetti Western genre. He is widely regarded as one of the most influential directors in the history of cinema.
Leone's film-making style includes juxtaposing extreme close-up shots with lengthy long shots. His films include the Dollars Trilogy of Westerns featuring Clint Eastwood: A Fistful of Dollars (1964), For a Few Dollars More (1965), and The Good, the Bad and the Ugly (1966); and the Once Upon a Time films: Once Upon a Time in the West (1968), Duck, You Sucker! (1971), and Once Upon a Time in America (1984).
Source : Wikipedia