Criminal Minds2005

Dr. Spencer Reid:
The praying mantis can kill and eat a multitude of creatures but the most interesting fact is that oftentimes the female mantis engages in sexual cannibalism, meaning she'll bite off the head of her mate once copulation is complete, sometimes even during intercourse, actually.

Alex Blake:
So, that's what someone did to our UnSub.

Dr. Spencer Reid:
It also explains why he shoots his victims in the heart.

Jennifer Jareau:
But the center of our UnSub's anger didn't bite off his head.

Dr. Spencer Reid:
No, but she hurt him so badly that she got into his brain.

Alex Blake:
So, he's flipping the script.

Dr. Spencer Reid:
He's completely taking it over. He basically sees the victims as the praying mantis out to destroy him, so before they can get to him, he rapes them, forces them to engage in cannibalism, thereby taking away their control of the situation. He's essentially walking them through the mating behavior of a captive praying mantis, only entirely on his terms. He even mirrors the decapitation of the insect by forcing them to eat pieces of a human head, only it's not a male human head, it's a female human head.

Aaron Hotchner:
The woman that's the core of his rage.

Dr. Spencer Reid:
Exactly. Now all women are his enemy. They're his predators and he believes they're out to get him.