Perpetrators of violent criminal acts in the municipal population are considered one of the most dangerous groups. Within this group, there is a specific group of perpetrators who have been persistant in the commission of criminal acts despite having been prosecuted. Such perpetrators are recidivists who have developed a criminal career by criminal offenses. Criminal career as a term implies a longitudinal series of perpetrators of criminal offenses by a person who has a notable number of criminal offenses in some period (Doležal, 2009). There is very little research into the peculiarities of their criminal career. Some of the results of foreign research of the criminal career of perpetrators of violent delinquents indicate that violent criminal offenses constitute a minority in the total number of criminal offenses of persons with criminal careers. Nevertheless, perpetrators of violent crimes during their criminal career rarely specialize in making only violent criminal offenses and tend to combine violent and other criminal offenses (Piquero, Jennings and Barnes, 2012). In the Republic of Croatia, so far, there have been very few investigations into the characteristics of the criminal career of perpetrators of violent delinquents, and this is precisely the purpose of this graduate thesis. The aim of this paper is to gain insight into the peculiarities of the criminal career of the mentioned perpetrators and to analyze their criminal career through four key dimensions of the criminal career concept: participation in the commission of criminal offenses, the frequency of criminal offenses, the gravity of criminal offenses and length of criminal career. The problematic issues relate to differences in the dimensions of the criminal career of perpetrators of criminal offenses, and a questionnaire that examines the peculiarities of a criminal career has been developed for this purpose. The data is collected by the method of insight into the documentation of the prisoners who are serving the prison sentence at the Lepoglava Prison.