MADILL, OK - A man who lost his sister in the Columbine High School massacre nearly 14 years ago, now travels the country to keep her legacy alive through a program called Rachel's Challenge.

Craig Scott survived the massacre at Columbine, but his 17-year-old sister Rachel did not.

"I was in the school library, which was the scene of the most intense shooting," Craig said. "The shooters were treating it like it was a game."

The pain is still very real for Craig as he reflects on what is known as the worst high school shooting in US history. On April 20,1999, two senior students entered Columbine High School and began shooting. Twelve students and a teacher lost their lives.

"I barely escaped with other students," Craig said. "I later learned that Rachel was the first person killed. She was one of the students who was questioned about her faith before they shot her."

Craig found a way to turn his pain into inspiration. He and his father Darrell started a program called Rachel's Challenge, honoring his sister's legacy. The program reminds students to be kind to one another, the way Craig said Rachel lived her life everyday.

"We have prevented school shootings, we stopped suicides," Craig said. "We have seen schools change for the better."

Hundreds of Madill students gathered in the gym to hear Rachel's story Monday.

Craig's message: never hold back from telling the people you love how you feel about them.

Students say they were moved by Rachel's story.

The event was sponsored by the Chickasaw Nation.