Simplify the following text for a Grade 11 native English-speaking person.
Original: Darryl F. Zanuck considered that Monroe 's film potential was worth developing and cast her in Niagara , as a femme fatale scheming to murder her husband , played by Joseph Cotten .
Simplified: Darryl F. Zanuck considered that Monroe 's film potential was worth developing and cast her in Niagara as a woman scheming to murder her husband , played by Joseph Cotten .