It has been two decades since one of the worst high school shootings in history was carried out.
Twelve students and a teacher were killed at Columbine, when two students opened fire before killing themselves.
One of those who died was Rachel Scott.
Her brother, Craig Scott survived, but watched two of his friends get shot and die in front of him.
It was a shooting that shaped history, so what has changed in 20 years and what can we expect to see in New Zealand as we recover from the Christchurch terror attacks?
Columbine survivor Craig Scott spoke to The AM Show.
Watch the video.
