Me too! Don't know how I missed this the first time around. When I was in high school I read everything I could about serial killers and other types of killers. I think it got me a reputation as kind of a weirdo in school, because I always had books of that sort in class. The oddball in the back who either sleeps through class or reads about murder is not the sort of person who wins Prom King.
I love Wikipedia's list indices for this. That's how I find new serial killers to read about. They have lists of serial killers by country, I think a list of "the worst" serial killers, list of women serial killers, etc, etc.