Word of the death plunged Niagara Falls High School, where Sheard was a sophomore, into mourning. By noon Thursday, his locker had turned into a makeshift memorial. Students brought cards with messages for their friend and his family. "We still don't know a whole lot other than the specifics of what happened," building administrator Phil Mohr said Thursday morning. "Our primary goal was to determine what was true and how to handle students arriving who were very, very upset." School officials assembled a crisis intervention team that included administrators, counselors, safety officers and a nurse. The team came up with...