In 1992, Dr. Mike Aamodt started to collect and code data on serial killers. Today, the database is the largest non-governmental serial murderer database in the world. It contains over 2800 subjects, comprising of serial killers, mass murderers, spree killers and more. The database has over 7500 victim profiles and over 500 documents. There are over 175 variables per subject, including background
information, victim preference, victim treatment and information about the crimes committed. The information gathered is from public documents including websites, books, court documents and government agencies. Data is available in both a case study format and as ready-to-use statistical information.