'The Walking Dead' takes first steps toward 'Rick-less' future

The post-apocalyptic zombie world will go on even after Rick Grimes -- the character played by Andrew Lincoln -- exits this season, at the star's request. But since "The Walking Dead" stumbled through the past two seasons, season nine opens in prove-it-to-me mode, at least for those who see Rick's departure as a good time to consider closing the books on this AMC hit.

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