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 perpetrated the Columbine High School massacre. Harris and Klebold killed 13 people and wounded 24 others on April 20, 1999, at Columbine High School, where they were seniors, in Columbine, Colorado. After killing most of their victims in the school's library, they simultaneously committed suicide. At the time, it was the deadliest high school shooting in U.S. history, with the ensuing media frenzy and moral panic leading it to become one of the most infamous mass shootings ever perpetrated in the US.