I love True crime shows and books! Do you?
yes, true crime are non-fiction literary and film genre in which the author examines an actual crime 
Yes! Something about those kinds of shows, books, whatever, really intrigues me. I know I'm not the only one, as true crime shows are very popular.
yes, it  commonly include murder, with tales of serial killers dominating the genre
Definitely. I've read about many different serial killers like Dahmer, Gacy and the like.
serial killer is a  person who murders three or more people, they have wicked hearth
Yes they do, very wicked hearts. Some of them never even get caught. I know this because of all the true crime shows I've watched.
Do you know that authorities apply different criteria when designating serial killers;