serial killers, serial killer, serial killers documentary, zodiac killer, zodiac killer documentary, dark5, dark 5, top 10, top 5, top 20, beer man, vending machine killer .\r<br>\r<br>serial killers, serial killer, serial killers documentary, zodiac killer, zodiac killer documentary, dark5, dark 5, top 10, top 5, top 20, beer man, vending machine .\r<br>\r<br>16 Year old killer girls story - BBC Do. A serial killer is traditionally defined as a person who has killed three or more people over a period of more than a month, .
