"Mr. Cruz, 19, himself called the authorities just after Thanksgiving, describing how he had been in a fight and was struggling with the death of his mother. “The thing is I lost my mother a couple of weeks ago, so like I am dealing with a bunch of things right now,” he said in a childlike voice, sounding agitated and out of breath."

https:// www.nytimes.com/2018/02/23/us/fbi-tip-nikolas-cruz.html

the "childlike voice" sure sounds like a good descriptor of a dissociated trauma victim.