Secret tapes recorded by Jacqueline Kennedy-Onassis may reveal that she believed that Vice-President Lyndon B. Johnson and Texas businessmen killed her husband President John F. Kennedy, reports said.

The secret tapes, which will be aired by U.S. network ABC, reportedly disclose that the former First Lady believed that her husband's successor plotted with businessmen of the South to assassinate JFK in 1963 and that the lone gunman, Lee Harvey Oswald, was part of a much larger conspiracy, according to the Daily Mail.

Johnson succeeded to the presidency following the assassination of John F. Kennedy, completed Kennedy's term and was elected President in his own right, winning by a large margin in the 1964 presidential election.

The tapes were recorded with leading historian Arthur Schlesinger Jr within months of the assassination on November 22, 1963, and had been sealed in a vault at the Kennedy Library in Boston, added the report. Mrs Kennedy had ordered that the tapes should not be released until 50 years after her death, fearing her revelations could endanger her family.

The Mail which cited ABC executives calling the tapes "explosive,"  reports the tapes also reveal Jacqueline Kennedy-Onassis admitting to having two affairs- one with Hollywood star William Holden and another with Fiat founder Gianni Agnelli -- as a reaction to her husband's indiscretions. The tapes are also believed to include a suggestion that President Kennedy was having an affair with a 19-year-old intern, added the report.

Jacqueline Kennedy went on to marry Greek shipping tycoon Aristotle Onassis. She died of cancer 17 years ago. It is believed that daughter Caroline Kennedy, 53, agreed to the early release of the tapes in exchange for ABC dropping its drama series about the family.