Samuel Goldwyn, who was feuding with director William Wyler after Wyler left the fold, insisted that Cathy divorce her husband Robert Wyler, William's brother. When she refused, she was let go by Goldwyn.
Cathy's ancestry was Irish.
Her chief leisure pursuit was writing poetry.
Her parents separated when she was a child.
In 1947, she accepted the Oscar for "Best Actor in a Leading Role" on behalf of Fredric March, who was not present at the awards ceremony.
Most sources give her birth year as 1925, but some give 1923.
Of Cathy's 17 films (all in starring or featured roles), 7 are film-noir or quasi-film-noir, making her a major contributor to the genre.
One secondary source gives her cause of death as cerebral hemorrhage, but all primary sources indicate cancer.