• Sept. 24, 2003: Two students -- Aaron Rollins, 17, and Seth Bartell, 14 -- were fatally shot at Rocori High School in Cold Spring, Minn. Fellow student John Jason McLaughlin, who was 15 at the time of the shooting, awaits trial in the case.
• March 5, 2001: Charles "Andy" Williams, 15, killed two fellow students and wounded 13 others at Santana High School in Santee, Calif., in San Diego County. Williams was sentenced to 50 years to life in prison.
• May 26, 2000: Honor student Nathaniel Brazill, 13, killed his English teacher, Barry Grunow, on the last day of classes in Lake Worth, Fla., after the teacher refused to let him talk to two girls in his classroom. He was convicted of second-degree murder and is serving a 28-year sentence.
• Feb. 29, 2000: A 6-year-old boy shot and killed a 6-year-old classmate at Buell Elementary School in Mount Morris Township, Mich. Because of his age, the boy was not charged.
• Nov. 19, 1999: A 13-year-old girl was shot in the head in school at Deming, N.M., and died the next day. A 12-year-old boy pleaded guilty and was sentenced to at least two years in juvenile prison.
• April 20, 1999: Students Eric Harris, 18, and Dylan Klebold, 17, killed 12 students and a teacher and wounded 23 before killing themselves at Columbine High School in Littleton, Colo.
• May 21, 1998: Two teenagers were killed and more than 20 people hurt when a teenage boy opened fire at a high school in Springfield, Ore., after killing his parents. Kip Kinkel, 17, was sentenced to nearly 112 years in prison.
• May 19, 1998: Three days before his graduation, Jacob Davis, an 18-year-old honor student, opened fire at a high school in Fayetteville, Tenn., killing a classmate who was dating his ex-girlfriend. Davis was sentenced to life in prison.
• April 24, 1998: Andrew Wurst, 15, opened fire at an eighth-grade dance in Edinboro, Pa., killing a science teacher. The boy pleaded guilty to third-degree murder and other charges and is serving 30 to 60 years in prison.
• March 24, 1998: Two boys, 11 and 13, fired on their Jonesboro, Ark., middle school from woods, killing four girls and a teacher and wounding 10 others. Both boys were convicted of murder and can be held until age 21.
• Dec. 1, 1997: Three students were killed and five wounded at Heath High School in West Paducah, Ky. Michael Carneal, 14, pleaded guilty but mentally ill to murder and is serving a life prison term.
• Oct. 1, 1997: Luke Woodham, 16, of Pearl, Miss., fatally shot two students and wounded seven others after stabbing his mother to death. He was sentenced to three life sentences plus 140 years.
• Feb. 19, 1997: Evan Ramsey, 16, took a shotgun to school in Bethel, Alaska, and killed the principal and a student and injured two others. Ramsey is serving a 210-year sentence.
-- Associated Press
