There have been cases of serial sexual offenders and studies dealing with such cases in the literature. However, no serial sexual offender case was reported in Turkey, to the best of our knowledge. In this article, as the first report from Turkey, we present a serial sexual offender who assaulted 27 women. The assailant entered a total of 29 houses, and assaulted victims in 27 of them, and he failed to assault two individuals. The 'modus operandi' of the offender was identical in all assault cases and led the police towards a hypothesis that these assaults were all committed by the same individual. The offender did not admit the assaults and strictly refused a forensic psychiatric examination. Being an individual with a high level of education, having a respected position and profession, choosing women aged older than 18 years as victims were among distinctive features of the presented offender. (C) 2012 Elsevier Ltd and Faculty of Forensic and Legal Medicine. All rights reserved.