In hindsight, the warning signs were abundant that Seung-Hui Cho was mentally troubled and potentially dangerous. However, authorities at Virginia Tech did not put together all the pieces until after the 23-year-old student opened fire on the Blacksburg campus on April 16, 2007, and killed 32 people before taking his own life. In the aftermath of…

In a residence hall on the campus of Virginia Tech in Blacksburg, two students had been shot to death. A couple of hours later, the tragedy multiplied by horrific proportions as across campus, 30 students and instructors were gunned down in a classroom building. As the details emerged of the worst shooting incident in U.S. history, educators and…