The Big Love star has signed up to appear in police drama The Killing, Zap2It reports.
She will play a Seattle homicide detective investigating the murder of a girl.
The show will also follow the victim's family, the suspects and the local politicians who get involved.
True Blood star Michelle Forbes and Deadwood's Brent Sexton have already joined the programme, along with Melrose Place actor Billy Campbell.
Monster director Patty Jenkins will helm the project.