04/10/2013 12:43 pm ET

Craig Scott, Columbine School-Shooting Survivor, Remembers The High School Massacre That Killed His Sister (VIDEO)

April 20, 1999 started out like any other day. Then the country was shocked to its core when news broke that 12 students and one teacher had been killed in a deadly rampage at Columbine High School in Colorado.

Craig Scott was 16 years old at the time of the massacre and had spent part of that horrific day huddled under a table in the Columbine library as the two shooters, students Eric Harris and Dylan Klebold, opened fire. Not only were two of Scott's close friends killed that day, but his 17-year-old sister Rachel also died.

In this clip from "Oprah: Where Are They Now?" Scott returns to Columbine High School and recounts the moments that led to his sister's death. "When the shooters approached the school, these were the stairs that they walked up," Scott says as he ascends the steps to the building's entrance. "And when they got to the top of the stairs, that's when they saw Rachel."

Scott says that his sister was mocked for her faith and then shot. "The last moment of her life was, Eric picked her up by her hair and said, 'You still believe in God?' And she said, 'You know, I do.' And he said, 'Well, go be with Him,'" Scott says in the clip.

What makes his sister's death especially difficult for Scott is that the two had fought on the way to school that morning. "The last thing that I did with my sister was… getting in a fight with her and calling her names, and then pulling up to school and slamming the car door shut on her," he says. "Now I make sure to tell my family almost every time before I hang up the phone that I love them."

After the shooting, Scott struggled with his deep-seated anger toward the killers. "I hated those guys," he says. "I used to fantasize what it would be like to get revenge on them."

Scott took out his anger on his family members, admitting that he was difficult to be around after the Columbine tragedy. But a trip to South Africa helped Scott turn things around, when he heard a man's story of losing 17 members of his family in Rwanda. "I thought, here's a man who hasn't let tragedy steal life from him but is still a wonderful person to be around. And I decided I wanted to be like that," Scott says.

Today, Scott says he has let go of his revenge fantasies. "If I were to meet the shooters now, I wouldn't want revenge on them," he says. "I feel kind of sorry for them."

"Oprah: Where Are They Now?" airs Tuesdays at 10 p.m. ET on OWN.


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