Ejogo will star opposite the Mahershala Ali in the new installment of the HBO anthology drama, reported Variety.
She will play Amelia Reardon, an Arkansas schoolteacher with a connection to two missing children in 1980.
The third season tells the story of a macabre crime in the heart of the Ozarks, and a mystery that deepens over decades and plays out in three separate time periods.
Ali is set to play Wayne Hays, a state police detective from Northwest Arkansas.
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