Columbine Shootings 10 Years Later: Students, Teacher Still Haunted by Post-Traumatic Stress

First in a series on the Columbine shootings, 10 years later. At his worst after he survived the Columbine shootings in Littleton, Colo., chemistry teacher Kent Friesen would become physically ill, often throwing up. Now, a decade later, certain triggers can still set off crying jags. Friesen remembers running past the bodies of two students in the science wing that day as he tried to get help for girls' basketball coach Dave Sanders, who was gunned down and eventually bled to death...Full Story