According to The Hollywood Reporter, Huston will appear in six episodes of the Emmy-winning drama, which is being held back to January for the start of its fourth season.
The trade paper says that Huston will play a character named Cynthia Keener, an investigator who enters into an unusual partnership with Patricia Arquette's Allison Dubois.
Huston won an Oscar for 1985's "Prizzi's Honor" and added nominations for "Enemies: A Love Story" and "The Grifters." She's also been nominated for five Emmys without a win, with her most recent nod coming in 2004 for the HBO telefilm "Iron Jawed Angels." Her most recent television stint was a four-episode arc on Showtime's "Huff."