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Eric Harris (18) and Dylan Klebold (17) killed twelve students and one teacher at their high school. They injured twenty-one additional people. Eric and Dylan committed suicide at the end of the shooting.
http://www.nytimes.com/1999/04/21/us/terror-littleton-overview-2-students-colorado-school-said-gun-down-many-23-kill.html -
Charles Andrew Williams (15) fatally shot two students and wounded thirteen others in his high school.
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Jeffery Weise (16) shot and killed his grandfather and his companion in his grandfathers house. He then went to his Red Lake Senior High School and and killed five students, one teacher, and one security guard. Weise wounded seven other people and then committed suicide.
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Seung-Hui Cho (23) shot and killed thirty-three students and staff members at the college he attended, Virginia Tech. Cho wounded seventeen others and later committed suicide.
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Steven Kazmierczak (27) shot and killed a total of five people at Northern Illinois University. Kazmierczak injured twenty-one total people, then proceeded to commit suicide.
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One L. Goh (43) was accused of fatally shooting seven students and wounding three others at Oikos University. Goh was later deemed mentally unfit for trail and was committed for treatment.
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Adam Lanza (20) killed his mother at their home in Newtown, Connecticut. Lanza then went to Sandy Hook Elementary and killed twenty first graders and six staff members. Two others were injured in the attack. Lanza then proceeded to commit suicide.
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Jaylen Fryberg (15) fatally shot four students in the school cafeteria, injured one, then committed suicide.
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Nikolas Cruz (19) fatally shot seventeen people and injured fourteen others at his former high school, Majory Stoneman Douglas High School.