The 58-year-old actress, who was chosen to play the villainous Margot, a British national and the widow of a notorious terrorist, had quit the show due to personal reasons, said The Hollywood Reporter.
'24: Live Another Day', which is set four years after the events of season 8 of miniseries '24', follows the further exploits of Jack Bauer (Sutherland).
Davis was to have co-starred with Kim Raver, William Devane and Mary Lynn Rajskub, who are reuniting with star Kiefer Sutherland in reprising their '24' roles.