Numerous studies, interviews, observations or probing inquiries and analyses of homicide as a forbidden act allow the investigators to thoroughly distinguish and explore the motives, the personality and the environment of the perpetrator. The act of killing, regardless of the motive, is always conditioned by various factors such as family, upbringing, environment, society, life experiences, diseases, injuries, relations with others, etc. It is, as it can be clearly seen, a wide spectrum, of which the motives and the perpetrator’s functioning in the world constitute only a small part. The motivation is crucially important as it provides us with information about the direct cause of the murder and it allows us to organise the crime of killing into appropriate categories. Homicide can be classified into the following categories based on the type of motive: sexual, economical, emotional and fear factor which is extremely important in the diagnostic process as well as during the stage of making a psychological and personal profile of the perpetrator who killed someone. While analysing the crime, it should be remembered that although we are dealing with people who committed the same kind of crime, it is the different motive that differentiates the offenders both in terms of their personality and in the way they treat their victims. The murder itself is not a spontaneous incident but a lifelong process that might result from the whole range of factors and life situations.