 This episode marked the last regular appearance of Emma Bell ( Amy ) , whose character was killed off in the conclusion of the installment . Greg Nicotero , the show 's production designer , enacted the walker who bites Amy . Bell stated that Nicotero placed a skin @-@ colored prosthetic around her neck , which consisted of a layer of red viscous liquid and a hose . Once it was bitten into , the prosthetic exploded and resembled a severe flesh wound . Kirkman expressed that it was difficult for him to remove Bell from the cast but was thankful that she understood she would only be limited to a certain number of episodes ; he stated : 
