Imo, Kenneth McDuff(TX), Otis Toole(FL), and Henry Lucas(TX) are 3 of the worst. The numbers are so many. It is difficult to classify the worst.. Serial Killers seldom tell the truth or give up all their victims. Investigators/prosecutors rarely reveal the complete victim totals to prevent scaring the bejeezus out of the public, imo.. The most notorious serial killers have never been identified, imo. In 2004, a state LEO contacted the FBI BAU2 and alerted them that there was an extremely high number of females being located near interstates. The FBI began the Highway Trucker SK iniative in 2009. 500 victims and 200 POIs & suspects were connected via FBI VICAP. That was 4 years ago. Not sure what the totals are now.
Highway Serial Killings
New Initiative on an Emerging Trend
http://www.fbi.gov/news/stories/2009/april/highwayserial_040609
The Long Island Serial Killer is nicknamed 'LISK'..
If you think about it, the total number of active serial killers has grown tremendously in the USA since 2005 when a serial killer was redefined and the total victims were lowered from 3 to 2 by the FBI BAU2 symposium attendees. It would be logical to conclude that Chicago, and other cities with gang wars, drivebys, and increasing homicides rates would have an abnormal rate of serial killers, jmo.
http://www.fbi.gov/stats-services/publications/serial-murder/serial-murder-1
Behavioral Analysis Unit-2
National Center for the Analysis of Violent Crime
CIRG - FBI
http://www.fbi.gov/stats-services/publications/serial-murder/serial-murder-1
Serial Murder Symposium 2005
The different discussion groups at the Symposium agreed on a number of similar factors to be included in a definition. These included:
• one or more offenders
• two or more murdered victims
• incidents should be occurring in separate events, at different times
• the time period between murders separates serial murder from mass murder
In combining the various ideas put forth at the Symposium, the following definition was crafted:
Serial Murder: The unlawful killing of two or more victims by the same offender(s), in separate events.