Scott Bonn, a serial-killer researcher and assistant professor of sociology at Drew University in New Jersey, said the explanation was simple. Because serial killers often prefer to live in densely populated areas for easy access to potential victims it is not a surprise that three of them who specialized in sex workers had turned up over two decades in a place with a population of 2.8 million. The odds that you would have these three guys in rural Mississippi in that time period are far less likely than in a densely populated area like Long Island, he said...
...The Rifkin and Shulman cases, it turns out, shared strange coincidences: Mr. Rifkin and Mr. Shulman lived a few miles from one another, and they committed some of their murders at the same time, though they did not appear to know one another...
...Long Islands latest serial killer could have been not the third but the fourth in recent years, if the definition of serial killer was looser. In 1990, Allen Gormely, 37, a carpenter, confessed to killing prostitutes...