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https://www.worldatlas.com/crime/countries-that-have-produced-the-most-serial-killers.html

Countries That Have Produced The Most Serial Killers Discover the countries with the highest number of serial killers, led by the USA, and learn about the most notorious cases worldwide.

https://www.ranker.com/list/serial-killers-with-mental-illness/ranker-crime

8 Serial Killers Who Suffered From Mental Illness Psychologists have spent decades studying the brains of known serial killers in an attempt to discover what makes them tick. Are serial killers built just like the rest of us, or are their brains wired differently? What makes them become vicious, unrepentant killers? Many serial killers suffer...