Analysis of information sources in references of the Wikipedia article "Serial killer" in English language version.
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Just killing several people isn't necessarily enough for most definitions [of a serial killer]. More often, it has to be a series of similar crimes, committed over a period of time, usually more to satisfy a psychological urge on the killer's part than any more practical motive." He adds: "The murders we can connect 'Holmes' to generally had a clear motive: someone knew too much, or was getting in his way, and couldn't be trusted. The murders weren't simply for love of bloodshed but a necessary part of furthering his swindling operation and protecting his lifestyle.