Ryan Christopher Clark

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(CBS/AP)  Ryan Clark 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, 22, was from Martinez, Ga., just outside Augusta. He was a fifth-year student working toward a triple-degree in psychology, biology and English and carried a 4.0 grade-point average. He was also 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."