BOISE — The man charged with the stabbing deaths of four University of Idaho students has spent much of his teen and adult life consumed by a rare neurological disorder known as visual snow syndrome.

“He would talk about it, like, all the time,” Thomas Arntz, a former friend of Bryan Kohberger’s in high school, told the Idaho Statesman in a phone interview. “The word that comes to mind is that he was neurotic about it, and talked about it relentlessly. I guess it truly bothered him to no end.”

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