Dylan Klebold and Eric Harris, the perpetrators, killed 12 students and 1 teacher. They injured 21 people and then killed themselves. It was branded as the most deadly school shotting of the time. The tragedy has caused many "copycat killers" and has stirred up panic around violent media.On April 20th 1999, two senoirs at Columbine High School engaged in a massacre that would scar thousands of people for years.