Sylvia Seegrist, unable to buy her tranquilizers one day, went to the Springfield Mall in the Philadelphia area and started shooting. A young man finally subdued her, but by then, many had been killed. Her case initiated legislation about the mentally ill and a great deal of controversy over whether someone so disturbed is capable of understanding right from wrong.

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Can we predict extreme fatal violence? An exploration of the causes behind incidents of mass murder.

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