Jessica Chastain set to go native as Sitting Bull's 'white squaw'

Jessica Chastain is in negotiations to play the real-life artist who became Native American leader Sitting Bull's personal assistant.

If she signs on for the role, The Martian star will portray Caroline Weldon, a 19th-century Brooklyn artist and activist who moved to the Standing Rock Reservation in what is now South Dakota to help Sioux chief Sitting Bull fight to keep his tribe's land.

Weldon was dubbed Sitting Bull's white squaw as she fought for the rights of the Sioux, while living among them.

Woman Walks Ahead will be directed by Nanny McPhee's Susanna White from a screenplay written by Peaky Blinders creator Steven Knight, according to The Hollywood Reporter.