This paper examines the mug shots of the detainees produced by the Khmer Rouge machinery at the center of torture and extermination called S-21. These images played a key role for the regime's perpetrators in the process of identifying, repressing and killing the numerous enemies that the paranoia of conspiracy had conceived between 1975 and the beginning of 1979. Yet, these images are used since the vietnamese liberation of Cambodia as 'images of victims' and as such exhibited in the Tuol Sleng Genocidal Museum. This paper aims to carefully analyze the mechanism through which the images were produced by the executioners' machine as a basic step in a chain. In so doing, the photographic act reveals itself as part of a sequence that has left a trace in the photo itself. Then, the article addresses the migration these images have experiences, from museum and art galleries to memorial museums, from books and internet databases to the criminal court.