April 20th, 1999
Columbine High School massacre: Two gunmen kill 13 people and injure 24 others before committing suicide at Columbine High School located in Jefferson County, Colorado. event on April 20, 1999. Read about how to open files in Open File Database.
Events around April 20, 1999
| April 22nd, 1999 | Death | Apostolos Nikolaidis, Greek singer (born in 1938) |
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