you are thinking of serial killers. But i can try. this stuff takes a long time to dig up though, so bear with me.
take out DC and every thing will look a lot rosier
Some of my formulas were screwed up previously, here is the gist:
I didn't go to the spreadsheets, but I didn't see any immediate correlation between murder and either population density or education - so far, poverty is our best predictor.
I wonder if the trying to correlate the type of murder (murder 1, murder2, manslaughter, etc.) or "reason," for murder (crime of passion, financial gain, depression, etc.) would have a discernible demographic or geographic dimension... I'll try to find some stats along these lines to play with.
FBI expanded offense data for Homicides (all sorts of nifties, here): http://www.fbi.gov/about-us/cjis/ucr...d-offense-data
Serial killings are recurring murders that are unique events, as opposed to a single event.
If you kill ten people at a party, you are a mass murderer.
If you kill 1 person a day for 10 days, you are a serial killer.