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Independent Detective

Statistics & Research Center
Choose Your Research View Use the mobile-friendly layout, or fit the complete desktop statistics and map workspace onto this screen.

Research the Archive

Interactive Case Statistics

Compare several areas of the archive at once. Select categories, click chart selections, and review the numbered case files that match every active selection. Similarities can support responsible research, but they do not prove that cases are connected.

Choose Statistics

Select multiple categories to display them side by side.

Chart Style

Active Research Filters

Current Comparison

Loading archive statistics…

Cases Behind the Statistics

Matching Case Files

Select a chart option to narrow the case list.

    Explore by Location

    Interactive Case Map

    Explore numbered case files by approximate city location. Select filters to narrow the markers and linked case list. Map points represent general city centers and do not identify exact incident addresses.

    Loading map locations…
    Location notice: Markers show approximate city-center locations based on the archive’s recorded city, state or province, and country taxonomies. They are not exact case coordinates.

    Cases on the Map

    Matching Case Files

    The linked case list will update with the map.

      Using the Research Tools

      How to Explore the Statistics and Map

      Use the charts and map to explore recorded similarities between cases. These tools are intended to support responsible research and public awareness. Similar details do not necessarily mean that separate cases are connected.

      1. Choose Statistics

      Select one or more categories such as States, Years, Months, Case Types, Exact Ages, Gender, or Ethnicity. Each active category receives its own interactive graph.

      2. Select Chart Values

      Click a bar, circle section, or value beneath a graph to add it to the current comparison. Select the same value again to remove it.

      3. Combine Research Filters

      Filters from different categories work together. For example, select July, 1993, and Pennsylvania to review cases matching all three recorded details.

      4. Explore the Map

      Use the map filters to narrow cases by country, state or province, case type, year, or month. Select a marker to view cases associated with that approximate city location.

      5. Zoom and Review Locations

      Numbered map clusters represent several nearby locations. Select a cluster to zoom closer, then select an individual marker to view cases associated with that city.

      6. Open Matching Case Files

      The linked lists beneath the charts and map update automatically. Select a name to open the complete case file in a new browser tab without losing the current research results.

      Map location notice: Map markers represent approximate city-center locations based on the recorded city, state or province, and country. They do not represent exact incident addresses or precise case coordinates.