She was 62 years old.
The actress had stopped treatment and lost most of her famous locks.
Fawcett's longtime love Ryan O'Neal recently told Barbara Walters in a 20/20 interview that the two had planned to marry as soon as she could say "yes."
The interview airs tonight on ABC.
Fawcett and O'Neil's son, Redmond O'Neal, 24, is in jail on drug charges but was allowed a last visit with his mother.