Daughter Melissa Rivers made the claim in a memoir she has written for her late mother titled 'The Book of Joan: Tales of Mirth, Mischief and Manipulation'
The veteran comedian - who passed away last summer - kept a "fake flight manifest" she called "Death Flight 5000," which included several people she hoped would be killed in a fantasy air traffic accident, according to her daughter Melissa Rivers.
The 47-year-old actress made the claim in a memoir she has written for her late mother titled 'The Book of Joan: Tales of Mirth, Mischief and Manipulation' in which she also claims the star underwent a total of 348 cosmetic procedures during her lifetime.
And according to her daughter, the 81-year-old 'Fashion Police' star "loved to lie," with dishonesty being her key trait.
She said: "The woman loved to lie. Her relationship with the truth was like Jennifer Aniston's relationship with Angelina Jolie - they weren't close."
Elsewhere in the book about Joan, who died as a result of complications during surgery, Melissa claims her mother married her father Edgar Rosenburg after knowing him for just five days.
However, Melissa - who has 14-year-old son Cooper - said she is glad she has spilled some of her mother's secrets in the book, as she had always wanted to pen a hilarious memoir to be released after her death.
She told Newsday: "I thought, 'This is way too soon.' And then I thought, my mother would absolutely kill me if I didn't do this right away. Her joke was always that she wanted us to write a book together called 'Comedian Dearest,' a kind of spoof on 'Mommie Dearest,' and have it ready to go so that the minute she died I could have a book to publish. Obviously, we never did that, but she was serious. I probably should have told that story in the book."