This 911 call was placed by teacher Patti Nielson during the April 20, 1999, shooting at Columbine High School in Colorado. During the call, shooters Eric Harris and Dylan Klebold enter the library where Nielson, three teachers and 52 students were taking cover.

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On November 18, 1978, over 900 members of the People’s Temple Agricultural Project committed suicide by ingesting Kool-Aid poisoned with cyanide. Before the mass suicide, cult leader Jim Jones addressed his followers. This recording, known as FBI File No. Q042, captures Jones’s speech and the final moments of hundreds of people who took their own lives and the lives of their children at the Jonestown settlement in Guyana.

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Inspired by “Magnum Force,” two US Air Force airmen turned what could have been a simple robbery into a massacre and an experiment in torture by drain cleaner. But was the second man’s conviction an example of racial bias?

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In the wee hours of June 10, 1912, eight people–six of them kids –were murdered with an axe in the town of Villisca, Iowa. That crime remains a mystery. A century later the town would be once again rocked by a mass murder.

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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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James Holmes killed 12 people and injured another 58 during his shooting rampage at a screening of “The Dark Knight.” Now Holmes faces death himself at the hands of the state.

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On March 13, 1996, Thomas Hamilton, 43, opened fire inside a primary school in the Scottish town of Dunblane, killing 16 children and one adult. The massacre led to a ban on most handguns in the United Kingdom.

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On March 12, 2004, after years of abuse, incest and brainwashing, the grotesque family empire of Marcus Wesson came to a tragic end. As police surrounded the house where the Wesson family lived, shots rang out. In the end, the bodies of nine Wesson children–each shot through the eye–were found in a room furnished with antique coffins.

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Chris Coleman, the head of security for Joyce Meyer Ministries calls his police officer neighbor, worried after not being able to reach his wife. When police enter the house, they find a grisly scene. Coleman claimed had been receiving threatening messages at work that warned him his family would die if Meyer didn’t stop preaching. But an investigation quickly unraveled Coleman’s story.

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On March 6, 1995, Dennis, Brenda and Erik Freeman were buried in Allentown, Pa. That same day, David Freeman told police in a recorded interview how he, his brother Bryan and cousin Ben killed their family. Brothers Bryan and David had embraced the skinhead movement and Nazi ideals in a rebellion against their family’s strict Jehovah’s Witness beliefs.

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