His daughter was the first person to die at Columbine High School in 1999, but as horrible as that shooting was, Darrell Scott is having a tough time wrapping his head around the Newtown massacre.
"This is twice as many people and so many small children. It's just unthinkable, unthinkable," says Scott in a phone interview with FOX 26 News.
Scott had to wait 24 hours before getting confirmation that his daughter Rachel was dead, so he knows the agony many Conn. parents are going through right now.
"There's no way to describe it. It's an overwhelming feeling. Hopelessness. Fear. All the things you can imagine."
After the shooting, Scott established Rachel's Challenge, a program installed in schools to try to replace bullying with kindness. Speakers visit with three million kids each year.
Scott says Rachel's Challenge has stopped several school shootings and almost 500 suicides. He credits those statistics to feedback from the program website and Facebook page.
His advice to the grieving parents is simple.
"The best things that families can do is rely on friends and each other. What we tried to do is celebrate Rachel's life. Focus on the good memories."