I believe the FBI has now adopted 2 or more killings as the criteria for a serial killer - so he may already be there.
September 2005 --> http://www.fbi.gov/stats-services/publications/serial-murder
FBI Behavioral Analysis Unit-2
National Center for the Analysis of Violent Crime
Critical Incident Response Group
Federal Bureau of Investigation
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.
<BBM - read More>