Here is search logs of 650,000 AOL users. It's very interesting to view search history of particular person and analyze his personality. Let's do it together! Read more about AOL search database scandal or view research papers on web searching.
(Kyra Sedgwick delivers the clue.) If 2 or more murders have a similar type of victim & weapon, you might be dealing with one of these, a term popularized by Robert Ressler of the FBI