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Published 19:17 4 May 2014 BST
Updated 06:31 18 Dec 2014 GMT

Is that you?! Cooper buffed up for new role. [Image via Huffington Post]
Speaking to E! News, Cooper's co-star, Eric Close, told reporters about that "he put on like 40 pounds" during his transformation.
Close added: "He really takes this story personally and wants to do an honourable job for Chris' memory and for his family."Explore more on these topics: