'Walking Dead' actress Sonequa Martin-Green joins 'Once Upon a Time' cast in mystery role

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sonequa-martin-green-once-upon-a-time-walking-dead-gi.jpg Sonequa Martin-Green is headed from one popular genre series to another -- the recent "The Walking Dead" addition has also booked a recurring role on "Once Upon a Time."

"Dead" fans saw Martin-Green's debut in the midseason finale "Made to Suffer," playing the role of Sasha, the sister of Tyreese ( Chad L. Coleman) who led a new band of survivors into the prison. She's expected to play an important role in the second half of Season 3 when "Dead" returns to AMC on Feb. 10, 2013.

On "Once Upon a Time," Martin-Green has landed the mysterious new role of Tamara and will appear in multiple Season 2 episodes with the possibility of returning in Season 3. TVLine reported the casting and notes that details of the role are being kept under wraps.

How this may impact Sasha's future on "Dead" is unclear. The horror hit has already wrapped filming on Season 3. If Season 4 follows a similar production schedule, it would begin filming again around May.

We'll have to wait and see, but "Dead"-heads may not want to get too attached to Sasha.
Photo/Video credit: Getty Images