Twenty-three others were injured, and the two shooters -- Dylan Klebold and Eric Harris -- killed themselves.

CNN: Columbine seniors graduate under the shadow of shooting

In that incident, two teenage students, Dylan Klebold and Eric Harris, armed themselves with guns and bombs and shot people inside the high school.

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The profile also included a video tribute to the Columbine High School shooters, Eric Harris and Dylan Klebold, at the top of the man's favorites list.

CNN: Finnish gunman kills 10 at college

Many people have asked why the parents of Littleton gunmen Eric Harris, 18, and Dylan Klebold, 17, didn't know that their teen-agers were making homemade bombs and doing other preparations for the assault.

CNN: Town meeting looks at lessons from Littleton

It is not known if Harris actually took the medication, and investigators said Wednesday early toxicology tests performed by the medical examiner's office showed no evidence of drugs or alcohol in the body of either gunman, Harris or Dylan Klebold.

CNN: Columbine shooter was prescribed anti-depressant