Jane Toppan "Jolly Jane" - One of the most prolific female serial killers who killed over 70 people. She thought of herself as "The Angel of Death" for good reason. She experimented on patients with atropine, strychnine and morphine.
One does not simply watch one episode of Criminal Minds . Because there are 11 seasons to watch, and maybe it's been a few years since you watched it, and you decided you just wanted to watch the whole show over again.