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Jill St. John (26 May 1990 - present)
Natalie Wood (16 June 1972 - 29 November 1981) (her death)
Marion Marshall (22 July 1963 - 1970) 1 daughter
Natalie Wood (28 December 1957 - 27 April 1962) (divorced)
Biography from Leonard Maltin's Movie Encyclopedia:
Robert Wagner made a successful transition from callow youth in movies to suave leading man in television, although he has always relied more on charm than Method. Under contract to 20th Century-Fox at the age of 20, Wagner made his debut in The Happy Years (1950), and for several years was consigned to supporting roles in pictures like Halls of Montezuma (1950), Let's Make It Legal (1951), With a Song in My Heart, What Price Glory? (both 1952), and Beneath the 12 Mile Reef (1953). He played the page-boyed Prince Valiant in a 1954 screen adaptation, and was outstanding as the cold-blooded college-boy killer in A Kiss Before Dying (1956), the performance that convinced studio executives that he could carry a feature film.
Wagner starred in Between Heaven and Hell (1956), The True Story of Jesse James, Stopover Tokyo (both 1957), The Hunters (1958), and other Fox films in addition to appearing in multi-star vehicles such as All the Fine Young Cannibals (1960), Sail a Crooked Ship and The Longest Day (both 1962). No longer topbilled, the still-youthful Wagner also appeared in The Pink Panther (1964), Harper (1966), Banning (1967), The Biggest Bundle of Them All (1968), Winning (1969, playing a cad who steals Joanne Woodward from Paul Newman), The Towering Inferno (1974), Midway (1976), and The Concorde: Airport '79 (1979), among others. Wagner took center stage on TV in "It Takes a Thief" (1968-69), "Switch" (1975-78), and "Hart to Hart" (1979-84) a long-running success built entirely around the chemistry of Wagner and costar Stefanie Powers.
Wagner was married twice to actress Natalie Wood; they appeared together in All the Fine Young Cannibals and in 1976 costarred with Laurence Olivier in a wellreceived TV production of "Cat on a Hot Tin Roof." In recent years Wagner has become a staple of TV miniseries and madefors, including remakes of Indiscreet (1988) and This Gun for Hire (1991) and revivals of "Hart to Hart." Some time after Wood's death Wagner wed actress and longtime friend Jill St. John. His daughter, Katie Wagner, is a TV personality.