With Jack the Ripper and Ted Bundy serving as the poster children for serial killers, keeping track of murder sprees has become a sick pastime for some of the world’s darkest hobbyists.

Obviously, U.S. media tends to focus on American serial killers, but the truth remains that there are thousands of serial killers across the globe who have never received as much attention. And if you ask me, that’s what makes them even more terrifying.

Here are 13 of the world’s deadliest serial killers you’ve probably never heard of.

 

1. Alexander Pichushkin — The Chessboard Killer

 

Alexander Pichushkin -- The Chessboard Killer

Pichushkin became known as the Chessboard Killer following his arrest when dates for all his alleged murders were found written on a chessboard. He was convicted in Moscow of killing 48 people in 2007. Because of the severity of his killings, Russia briefly considered reinstating the death penalty.