Jacqueline Kennedy Onassis believed Vice President Lyndon B. Johnson was behind the assassination of her husband, according to tapes recorded by the former first lady just months after President John F. Kennedy's death, the Daily Mail reports.

The tapes, which are set to be released by ABC News, reportedly reveal that Kennedy Onassis believed then-vice president Johnson, along with businessmen in the South, planned the Nov. 22, 1963, assassination of her husband in Dallas.

Johnson succeeded to the presidency on Kennedy's death, completed his term and was elected president in his own right by a landslide in 1964.

"The tabloid reports about the content of the tapes are totally erroneous," an ABC News spokesperson said in a statement to FoxNews.com. "ABC News isn't releasing any content from those tapes until mid-September, at which point it will be clear how off-base these reports are. The actual content of the tapes provide unique and important insight into our recent past from one of the most fascinating and influential first ladies in American history."

According to the Daily Mail, Kennedy Onassis thought gunman Lee Harvey Oswald -- officially tagged as a lone assassin -- was part of a larger conspiracy involving Johnson.

Kennedy Onassis had ordered that the tapes not be released until 50 years after her death, fearing her revelations could endanger her family. It is believed that daughter Caroline Kennedy, 53, agreed to the early release of the tapes in exchange for ABC dropping a drama series about the family.

Jacqueline Kennedy went on to marry Greek shipping tycoon Aristotle Onassis. She died of cancer 17 years ago.