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The Most Puzzling Unsolved Serial Killer Cases in History

The Most Puzzling Unsolved Serial Killer Cases in History

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1. Jack the Ripper

Source: Public Domain / Wikimedia Commons

2. The Zodiac Killer

Source: San Francisco Police Department

3. The Family Murders

Source: moisseyev / iStock via Getty Images

4. The Doodler

Source: Sundry Photography / Shutterstock.com

5. The Monster of Florence

Source: RudyBalasko / iStock via Getty Images

6. Butcher of Mons

Source: sanmartin / Flickr

7. Lisbon Ripper

Source: pedrosz / Flickr

8. Łódź Gay Murderer

Source: WrS.tm.pl, Public domain, via Wikimedia Commons

9. Les Disparus de l'Isère

Source: matthewleesdixon / iStock via Getty Images

10. North Kanto Serial Young Girl Kidnapping and Murder Case

Source: Alpsdake, CC BY-SA 4.0 , via Wikimedia Commons

1. Jack the Ripper
2. The Zodiac Killer
3. The Family Murders
4. The Doodler
5. The Monster of Florence
6. Butcher of Mons
7. Lisbon Ripper
8. Łódź Gay Murderer
9. Les Disparus de l'Isère
10. North Kanto Serial Young Girl Kidnapping and Murder Case

It may seem that the United States has the highest crime rate in the world for several reasons. It does have the highest rate of gun ownership in the world and it also has the highest number of prisoners in the world, but when it comes to violent crime, the U.S. doesn't even rank in the top 10. This isn't to say that the crime rate isn't high, it just depends on the region.According to the FBI, a violent crime occurs every 24.6 seconds, and a murder occurs every 30.5 minutes. This might make it harder to solve every case. This could explain some of the most puzzling unsolved serial killer cases in history.

In 2017, the FBI's Uniformed Crime Report indicated that police had successfully and satisfactorily solved 61.6% of murders that occurred, which means around 40% of murders go unsolved. Additionally, the FBI estimates that there are around 50 active serial killers in the United States at any given time. But crime is not an issue that only plagues the U.S. Violence, and the issue of serial killers is a problem found throughout the world. Some of those listed here were from other countries.

24/7 Tempo compiled a list of the most puzzling unsolved serial killer cases in history, from the very famous to the lesser known. Then, we researched each killer and the incidents they were involved in. FBI research indicates that serial killing accounts for less than 1% of murders in the U.S. However, with 40% of homicides going unsolved, it may appear that serial killers are getting away with their hobby, and data on serial killings, particularly in the modern day, is quite limited. (These are the most prolific serial killers in history.)

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