Chandler Riggs - who used to star on The Walking Dead - left fans concerned as he posted an unexplained photo of himself in a hospital bed.The 21-year-old actor took to Twitter on Wednesday morning to share the photo of himself laying in full patient garb including protective face mask as he gave the thumbs up toward the camera.Riggs - who played Carl Grimes on the popular AMC zombie drama series - offered no explanation for why he was there but did caption the image to his 1.5million followers: 'we back.'Scroll down for video Mystery: Chandler Riggstook to Twitter on Wednesday morning to share the photo of himself laying in full patient garb including protective face mask as he gave the thumbs up toward the camera Coooral: Riggs played.
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