Eric David Harris (April 9, 1981 – April 20, 1999) and Dylan Bennet Klebold (September 11, 1981 – April 20, 1999) were two American spree killers and mass murderers who killed 13 people and wounded 24 others armed with firearms and knives on April 20, 1999, at Columbine High School in Columbine, Colorado. They were twelfth grade students at the high school. The shooting rampage came to be known as the Columbine High School massacre. Harris and Klebold committed suicide in the library, where they had killed 10 of their victims.