PARKLAND, Fla. -- Long before he slaughtered 17 people at the South Florida high school he once attended, Nikolas Cruz had a disturbing way of introducing himself.
"Hi, I'm Nick," he used to say, according to an acquaintance interviewed by CNN. "I'm a school shooter."
Cruz posed with guns and knives in photos posted on Instagram and made a chilling online comment about a mass shooting carried out in New York this summer.
"Man I can do so much better," he wrote.
His hints of future violence...