After yet another Colorado school shooting, Nicole Hockley of Sandy Hook Promise 's message carries both grief and urgency. Her youngest son was killed in the Sandy Hook Elementary School massacre more than a decade ago. Within weeks, she co-founded non-profit Sandy Hook Promise with one mission: to stop other families from enduring what she lives with every day.

Nicole Hockley with her son Dylan, who was murdered in the Sandy Hook Elementary School massacre Nicole Hockley

"This is exhausting," Hockley said in an interview with CBS Colorado following the Evergreen High School shooting. "I think one of the most exhausting things about this is that these acts are preventable. We have the solutions that we know work, and sometimes we just don't have the will to make them happen."

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