The data behind the serial-killer detector has some small issues.

The story also inspired us to check out his data. Hargrove collected as much homicide data as was available online by downloading the FBI’s Supplementary Homicide Report data from 1976–2015. He then went the extra mile to obtain additional and (until then) generally unavailable data from Alabama, Florida, Illinois, and D.C. He used unknown offender sex as a proxy for unsolved case and grouped these cases by geographic area (county or metro area), weapon, and sex. Such cases are unfortunately not uncommon, especially if the victims are women. (There are also cases of multiple homicides of young men and unknown offenders, but data suggests that women are more likely to be targeted by serial killers.) Studying these individual groups, he found that he was able to find cases of suspected serial homicides, with young women as victims and unknown offenders, and this is what led to the discovery of the

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