who acted alone and were neither medical professionals nor contract killers. Serial killers with 5 to 14 proven victims This part of the list contains all serial killers with five to fourteen proven victims who acted alone and were neither medical professionals nor contract killers. Serial killers with fewer than five proven victims This part of the list contains all serial killers with fewer than five proven victims who acted alone and were neither medical professionals nor contract killers. Medical professionals and pseudo-medical professionals Serial killer groups and couples Disputed cases * Proven victims being either victims the serial killer was convicted of killing, victims declared by the killer in a detailed confession, or those whose status as a victim most scholars of the subject agree upon. See also List of serial killers by country List of serial rapists by number of victims Explanatory notes References Lists by death toll serial victims