Indeed among the important symptomatic dimensions that are classically bound to this illness, some semiological regroupments seem to predict hetero-aggressive risks more than others. And this perception seems even clearer when the investigation is widened to cover the history of the patient, his/her personality traits, relational modalities and psychic representations. Therefore the concept of heboidophrenia that had become obsolescent in present day nosographies can constitute a clinical model that is still pertinent and propitious for new reflexions. To illustrate our remarks we have decided to present two strikingly similar clinical cases in spite of a great contextual difference. They relate to two patients suffering from schizophrenia who are untypical due to their murderous criminal history. After a comparative discussion our reflexion will widen to whether one can foresee such acts in this type of patient, and to the possibility of medical care…. Under the aegis of the Law.