The reason the woman killed her brother a week later was  so that she had a chance to meet the man she fell in love with at her sister's funeral. Her thought was that if he was a family friend and showed up for her sister's funeral, he would show up for her brother's as well giving her a chance to meet him again.

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If you got it, don't freak out. If you didn't, then that's good! This is similar to the idea that if someone doesn't mimic your yawn when you yawn it's because they lack innate empathy similar to a sociopath or psychopath. It's not a concrete study and doesn't have enough research to prove that it's actually a theory.

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So now that you've relaxed. Let's learn about Robert K. Ressler.