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Eighteen-year-old Eric Harris and 17-year-old Dylan Klebold kill 12 fellow students and one teacher before committing suicide in the school library.
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Edgewater Technology employee Michael “Mucko” McDermott shot and killed seven of his coworkers at the office in Wakefield, MA. McDermott claimed he had “traveled back in time and killed Hitler and the last 6 Nazis.
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Doug Williams, a Lockheed Martin employee, shot up his plant in Meridian, MS in a racially-motivated rampage. He shot 14 people, most of them African American, and killed 7 before killing himself.
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Sixteen-year-old Jeff Weise kills his grandfather and another adult, five students, a teacher and a security officer. He then kills himself.
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An Amish schoolhouse in Lancaster, PA was gunned down by 32-year-old Charles Carl Roberts, Roberts separated the boys from the girls, binding and shooting the girls. 5 young girls died, while 6 were injured. Roberts committed suicide afterward.
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A gunman, 23-year-old student Seung-Hui Cho, goes on a shooting spree killing 32 people in two locations and wounding an undetermined number of others on campus. The shooter then commits suicide.
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Wesley Neal Higdon, 25, killed five people at Atlantis Plastics Factory with a semiautomatic weapon before taking his own life.
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Maj. Nidal Malik Hasan kills 13 people and one unborn child and injures 32 at Fort Hood, Texas, during a shooting rampage. He is convicted and sentenced to death.
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Omar Thorton, 34, entered a warehouse owned by his former employer, Hartford Distributors, and shot and killed eight people with two semiautomatic weapons before committing suicide.
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Eight people died in a shooting at Salon Meritage hair salon in Seal Beach, CA. The gunman, 41-year-old Scott Evans Dekraai, killed six women and two men dead, while just one woman survived. It was Orange County’s deadliest mass killing.
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During the midnight premiere of The Dark Knight Rises in Aurora, CO, 24-year-old James Holmes killed 12 people and wounded 58. Holmes was arrested outside the theater.
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Shots are fired inside the Washington Navy Yard, killing 12. The shooter, identified as Aaron Alexis, 34, is also killed.
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Gunman Christopher Sean Harper-Mercer shoots and kills nine people, injuring another nine, at Umpqua Community College in Roseburg, Oregon. The shooter dies after a gun battle with police at the college. Six weapons were recovered at the school; another seven were recovered at Harper-Mercer's home.
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Omar Saddiqui Mateen shot at least 49 people are killed and more than 50 are injured. Police shoot and kill Mateen during an operation to free hostages officials say he was holding at the club
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stephen paddock went inside of the hotel and shot a security guard before he started shooting in the crowed killing 58 people and injuring almost 500.
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he gunman shot 17 people and 14 others were wounded including several life-threatening injuries at Florida high school.