Serial killers are among the most terrifying people imaginable, partially because of how unfathomable their crimes can be. Many serial killers look for a specific type of victim, while other serial killers will prey on any type of person.
One thing (of many) that makes serial killers so scary is that anyone can fall victim to them - and that the culprits are typically elusive and unknown. Many of the worst serial killers appeared to be friendly neighbors or easy-going coworkers that one would never suspect of killing numerous human beings. Many would consider the serial killers on this list to be some of the scariest due to their methods, motives, and personalities.
Once you've read the list, vote for those that you consider to be the most chilling.