LAST NIGHT WERE IN TEL AVIV COMING AND FIRST, ONLY HERE AT 9.30, FROM HEARTBREAK TO HOPE ALL WEEK. WE ARE REMEMBERING THOSE KILLED COLUMBINE HIGH SCHOOL. >> IN LITTLETON, THAT'S RIGHT. THE TRAGEDY HAPPENED 25 YEARS AGO TOMORROW, 12 STUDENTS AND ONE TEACHER WERE KILLED. AMONG THEM 15 YEAR-OLD DANIEL MAUSER WHOSE FATHER DECIDED TO WHERE THE VERY SHOES HIS SON DIED IN TO SPREAD HIS MESSAGE OF SCHOOL SAFETY. 25 YEARS LATER, THOSE SHOES ARE STILL TAKING HIM ON A JOURNEY. HE NEVER IMAGINED. HE ONLY WEARS THAT WHEN HE TALKS PUBLICLY ABOUT HIS SON. BUT THESE SNEAKERS WORN BY DANIEL MAUSER ON APRIL, 20TH 1999. >> THE DAY THE 15 YEAR-OLD SOPHOMORE DIED AT COLUMBINE HAVE FORGED A PATH FORWARD FOR HIS FATHER, TOM TOOK A LITTLE WHILE. BUT IT STARTED THE CURRENT. MEANWHILE, VERY SYMBOLIC. >> WEAR HIS SHOES. I'M WALKING IN, DANIEL, IS HOW I HONOR HIM SPECIAL. WHEN I GOT THE SHOES, THE ONE HE WAS WEARING ON APRIL 20TH. >> WOULD LIKE IT WAS INSPIRING. IT WAS ENABLING. IT THE SPIRITUAL THING. YOU KNOW, MOUSER HAS DEDICATED THE LAST 25 YEARS TO FIGHTING FOR GUN CONTROL AND HE SUCCESSFULLY HELPED PASS A BALLOT MEASURE REQUIRING BACKGROUND CHECKS FOR ALL GUN BUYERS AT GUN SHOWS CLOSING A LOOPHOLE THAT HELPED A FRIEND OF THE COLUMBINE GUNMAN. >> GET MOST OF THE WEAPONS USED IN THE ATTACK AND WE'VE SEEN A NUMBER BILLS PASSED. BUT, YOU KNOW, NONE OF THOSE GUNS AWAY FROM PEOPLE WHO ARE LAW ABIDING CITIZENS, TALIBAN'S HOME SCHOOL DISTRICT HAS A RENEWED FOCUS ON SCHOOL SAFETY WITH THE OPENING OF THE FRANK DEANGELIS COMMUNITY SAFETY CENTER NAMED FOR THE SCHOOL'S ICONIC PRINCIPAL. AT THE TIME OF THE SHOOTING. IT'S INSIDE OLD ELEMENTARY SCHOOL THAT'S BEEN CONVERTED INTO A TRAINING CENTER FOR MORE THAN 200 AGENCIES WHO'VE COME HERE FOR ACTIVE SHOOTER TRAINING GIVES ME A LOT OF PRIDE. I WISH. >> THE BUILDING DID NOT EXIST BECAUSE OF THE EVENT THAT HAPPENED AT COLUMBINE. BUT THESE EVENTS CONTINUE TO HAPPEN IN OUR OFFICERS NEED TO BE TRAINED IN THE 5 YEARS IT'S BEEN OPEN. THE CENTER'S 170,000 PEOPLE. I THINK. >> COLUMBINE AND BEING THE ONLY DISTRICT WITH 3 SCHOOL SHOOTINGS. WE'RE FORCED INTO BECOMING GOLD STANDARD. I THINK OUR COMMUNITY DESERVES TO KNOW THAT WE'RE DOING SOME THINGS ABOVE AND BEYOND JUST THE GENERAL EXPECTATIONS AROUND SCHOOL SAFETY TO KEEP OUR KIDS SAFE, A MAJOR INVESTMENT TO TRY AND ENSURE NO FATHER LIKE TOM MOUSER. >> EVER HAS TO WALK IN HIS CHILD'S SHOES AGAIN DOING THIS FOR DANIEL I I CAN GET THROUGH THIS TOMORROW MORNING. FRANK DEANGELIS WILL CARRY OUT HIS ANNUAL RITUAL ON APRIL. 22 LIVE STREAM FROM INSIDE COLUMBINE, READING THE NAMES OF THE 12 STUDENTS AND ONE TEACHER KILLED. >> AND THEN HE'LL CALL EACH OF THE FAMILIES OF THOSE KILLED.