Virginia Tech Massacre

Clark, biology and English major, was called "Stack" by his friends, many of whom he met as a resident assistant at Ambler Johnson Hall, where the first shootings took place.

Clark was from the Atlanta suburb of Martinez, Ga. He was a fifth-year student working toward degrees in biology and English, and a member of the Marching Virginians band. "He was just one of the greatest people you could possibly know," friend Gregory Walton, 25, said after learning from an ambulance driver that Clark was among the dead. "He was always smiling, always laughing. I don't think I ever saw him mad in the five years I knew him."

In an interview with TIME, Peter Hurley, 18, described his friend Clark:

"He was a nice guy, really a nice guy. He was also a fairly fun-loving guy. I would always see him when I was coming back to the dorm, he'd be hanging out outside. When he laughs, it was really loud, so you could always see him and hear him both. Even though he was an RA, he didn't have too many problem with too many people. He was big on the rules, but even after you got in trouble with him, he would talk to you.

"He was a 5th-year senior and he was really smart. I know he was working on multiple degrees. There there is one thing else about him: He was always responsible for a bulletin board on the hall wall. And lots of people would always just slap something up there and let it stay the whole semester. But he would do something different every week, and would change it to try to make the hall more interesting. He would draw these 4-ft.-tall cartoons of the Looney Tunes, and it would be funny. You'd be walking out of the hall in the morning, already having a crappy day, and they would make you smile. He would draw that stuff freehand — and he was pretty good at it."

—AP