A partir do filme de Tim Robbins, Dead Man Walking, a autora busca entender os atos e a personalidade de Matthew Poncelet, personagem condenado à morte por um assassinato cruel. A relação do assassino com a freira que o acompanha, dando-lhe suporte baseado em empatia e verdade, permite a integração do seu self, com o reconhecimento e aceitação de sua finitude. Os conceitos teóricos de Winnicott sobre a origem da agressividade e do desenvolvimento infantil, bem como sobre a relação da (...) mãe com seu bebê, fundamentam as idéias aqui apresentadas.The author tries to understand the behavior and the personality of Matthew Poncelet, from a Tim Robbins' film called Dead Man Walking. This character was sentenced to death due to a cruel murder. In the film, the relationship between the killer and a nun gave him support based on empathy and truth. This permitted the integration of his self with the recognition and the acceptance of his finitude. The ideas presented in this paper were established based on Winnicott's concepts about the origin of aggressiveness and of infant development, as well as the relationship between the mother and her baby. (shrink)