Eric David Harris (April 9, 1981 – April 20, 1999) and Dylan Bennet Klebold (; September 11, 1981 – April 20, 1999) were an American mass murder duo who killed 13 people and wounded 24 others on April 20, 1999, at Columbine High School in Columbine, Colorado, United States. Harris and Klebold, who were seniors at the school, simultaneously committed suicide in the library, where they had killed ten of their victims. This became known as the Columbine High School massacre. At the time, it was the deadliest school shooting in history, leading it to be one of the most infamous shootings ever perpetrated.