It pays to ride with Rick Grimes.Indeed, Chad L. Coleman and Sonequa Martin-Green , who recurred on Season 3 of The Walking Dead as Tyreese and Sasha, have been upgraded to series regulars for the fourth season of AMC’s zombie-apocalypse smash, TVLine has learned.Additionally, Emily Kinney — who joined the show in Season 2 as Hershel’s youngest daughter Beth — has also been elevated to a regular.Coleman and Martin-Green’s promotions come after Sunday’s Season 3 finale saw their brother-sister duo refuse to help The Governor carry out

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