DENVER — Twenty-five years ago, Michelle DiManna sat in the math office at Columbine High School grading papers and talking to a colleague when she heard students screaming in terror.

Two heavily armed shooters had entered the Jefferson County school late in the morning on April 20, 1999, and proceeded to kill 12 of their classmates and a teacher, injuring dozens more in a tragedy that shocked Colorado and the nation.

The massacre, which ended with the two killers taking their own lives, reshaped school security across the United States and served as a precursor to the litany of mass killings that have taken place across the country in the decades since — so much so that the school’s very name, Columbine, remains synonymous with school shootings.

But what happened next, after DiManna fled the building with her colleagues and pupils, is also part of Columbine’s legacy, the one that, 25 years later, both current and former employees talk about the most: the resiliency and hope that persists in a community marked by one of the deadliest school shootings in American history.

“We take care of each other,” DiManna, who still teaches math at the high school, said in a recent interview. “You don’t really leave your family after trauma — and that is what Columbine is.”

And that’s why the 53-year-old, who will retire at the end of this academic year, has spent her entire career at Columbine despite such tragedy. DiManna is one of 15 current Columbine staff members who were either employees or students at the time of the shooting.

As Jeffco Public Schools marked the shooting’s 25th anniversary, officials held a media day with Columbine and district staff earlier this month to talk about the changes to school security that occurred nationwide in the wake of the shooting, such as lockdown drills and the creation of Safe2Tell, Colorado statewide anonymous reporting system for students.

Much has changed in 25 years. Those who were students at the time of the shooting have become parents and the pupils that now sit in the high school’s classrooms are too young to remember the tragedy, having not been born until years later.

One thing that hasn’t changed, though, is that at 11:20 a.m. each April 20 — around the time the shooting began — former Principal Frank DeAngelis gathers at the school with families and staff to read the names of the 12 students and one teacher who died that day: Cassie Bernall, Steven Robert Curnow, Corey Depooter, Kelly Fleming, Matt Kechter, Daniel Mauser, Danny Rohrbough, Dave Sanders, Rachel Scott, Isaiah Shoels, John Tomlin, Lauren Townsend and Kyle Velasquez.

“Columbine represents a time to remember,” said DeAngelis, who served as principal for almost two decades, and made it his mission to rebuild the school after the shooting and to help his students through the trauma.

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