The serial killer with the most victims was only sentenced to 22 years in prison.
Luis Cubillos (aka La Bestia) is a Colombian rapist and serial killer. In 1999, he admitted to the rape and murder of 140 young boys. The number of his victims, according to the locations of skeletons listed on maps he drew in prison, eventually exceeded 300.
This number has earned him the title of “the world’s worst serial killer.” Once captured, he was originally sentenced to 30 years. However due to his confession and cooperation, Colombian law allowed him to apply for special benefits, including a reduction of his sentence to 22 years, and possibly an even earlier release for continued good behavior.
Colombian law has since increased the maximum penalty to 60 years in prison. However, the new penalty did applicable to Cubillos. In 2006 however, his sentence was extended due to the existence of crimes that he did not originally confess to and was not condemned for.