Columbine Killers

A cross with Eric Harris' name sits on a hill with 14 other crosses above Columbine High School in Littleton, Colo., April 28, 1999. The words "How can any one forgive you?" are written under his picture. Harris and Dylan Klebold opened fire inside of Columbine High School April 20, 1999, killing 12 students and one teacher.

Dylan Klebold is shown in a 1998 yearbook photo from Columbine High School in Littleton, Colo.

Klebold yells into the camera in this image made from video released by the Jefferson County Sheriff's department Feb. 26, 2004. The video was made as part of a school project by Harris and Klebold, prior to the killings at Columbine High School.

Eric Harris is shown in a 1998 yearbook photo from Columbine High School in Littleton, Colo.

Harris yells into the camera in this image made from video released by the Jefferson County Sheriff's department Feb. 26, 2004. The video was made as part of a school project by Harris and Klebold, prior to the killings at Columbine High School.

Harris and Klebold are shown in an image made from video as they walked the hallway at Columbine High School, wearing trenchcoats. The video was made as part of a school project.

Harris, left, and Klebold are shown in an image made from video released by the Jefferson County Sheriff's department Feb. 26, 2004. The video was made as part of a school project.

Klebold is shown firing a sawed-off shotgun in this frame grab of a video tape released by the Jefferson County Sheriff's Department Oct. 22, 2003. According to authorities, the tape was made six weeks prior to the attack at Columbine High School on April 20, 1999.

Klebold is shown firing a sawed-off shotgun in this frame grab of a video tape released by the Jefferson County Sheriff's Department Oct. 22, 2003.

Harris, right, is shown aiming a pistol at a schoolmate in this image made from a video released on tape by the Jefferson County Sheriff's department Feb. 26, 2004. The video was made as part of a school project at Columbine High School.

Harris, left, and Klebold, carrying a TEC-9 semi-automatic pistol, are pictured in the cafeteria at Columbine High School during their April 20, 1999, shooting rampage. Both gunmen killed themselves later in the school library. This still image is from a video tape released by the Jefferson County Sheriff's Department.

Black plastic drapes the memorial crosses of Dylan Klebold, right, and Eric Harris, left, on a hill above Columbine High School in Littleton, Colo., April 30, 1999. The crosses were placed on the hill as a memorial to all 15 people who died in the shooting rampage at the school.