On May 21, 1998, 15-year-old Kipland Kinkel opened fire at his Oregon high school’s cafeteria. When police went to his home after the shooting, they found that Kip had shot his parents too.

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On May 20, 1998, 15-year-old Kipland Kinkel was expelled from school for having a loaded handgun in his locker. When he came home, his parents weren’t pleased and threatened to send him to boarding school. He shot them both to death. The next day, Kip went to school and started firing. He killed two students and wounded 25.

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On May 20, 1988, recently divorced Illinois woman Laurie Dann handed out poisoned snacks and drinks to the people she thought had wronged her, including children she babysat. She then entered an elementary school and opened fire, killing one boy and wounding two girls. Afterwards, she holed up at the home of the Andrew family. She held them hostage and shot the husband before killing herself.

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Wednesday NOPD arrested Akein Scott, 19, the man they believe to be the suspect seen on surveillance cameras opening fire on a Mother’s Day parade in New Orleans, wounding 19 men, women and children, some critically.

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On May 8, 1984, Canadian Army Corporal Denis Lortie, disgruntled and dressed in military fatigues, entered the Parliament building in Quebec City and started firing. He killed three and injured 13. His crime would later inspire another Canadian mass shooter, Marc Lepine.

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What atrocity happened in your neck of the woods? A photographic look at the largest mass murders and shooting sprees perpetrated in each state.

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On April 16, 2007, a gunman opened fire in a dorm and classroom at Virginia Tech in Blacksburg, Va., killing at least 30 people in the deadliest shooting rampage in U.S. history, according to government officials.

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Former LAPD officer Christopher Dorner has killed three near Los Angeles after vowing in an online manifesto to take revenge against those responsible for his 2008 termination. A large-scale manhunt for Dorner is underway in Southern California and Nevada where he is believed to be at large. He is well armed and extremely dangerous.

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The past year has been rife with tragedy. Many communities throughout the country–most memorably Aurora, Colorado, and Newtown, Connecticut–have been shattered by shootings that claimed the lives of dozens of people. Crime Library has put together an interactive map of the public place shootings of 2012.

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Jared Lee Loughner, who killed six people and wounded 13 others, including then-Congresswoman Gabrielle Giffords, has been sentenced to seven consecutive life terms plus 140 years. On January 7, 2011, Loughner opened fire outside a Safeway grocery store where Giffords was giving a speech.

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