Adam Lanza, the Newtown, Conn., teenager who shot and killed 20 Sandy Hook Elementary School students and six staffers — and then himself — in December, was diagnosed with a medical condition at age 6 that made it unbearable for him to be touched.
With a sensory integration disorder, according to a PBS investigation that aired Tuesday evening and was subsequently reported by ABC, Lanza couldn't deal with being touch or with chaotic situations, including loud, bustling school hallways and classrooms. As the years progressed, he became increasingly isolated, ABC reported.
Those with the condition are sometimes even put off by the clothing they wear, ABC said.
Sensory processing disorder patients are also unable to respond normally to pain and extreme temperatures and often find light — and some foods — unbearable, ABC said.
"The most surprising thing for me was this sort of inwardness of Adam, a world view of someone that was afraid of the world," said PBS Producer Frank Koughan, according to ABC, "He just reacted badly to the whole world and didn't want to be part of it. He was not some violent monster, except on one particular day, when he was exceedingly monstrous."
Lanza's Dec. 14 shooting spree began with the killing of his mother, whom he shot four times in her bed before heading to the school.
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