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The story hits the news every once in a while, but it always seems like such an extreme case: A hospital staffer confesses to killing multiple patients over time, usually with fatal injections and often under the pretense of a "mercy killing."

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The story hits the news every once in a while, but it always seems like such an extreme case: A hospital staffer confesses to killing multiple patients over time, usually with fatal injections and often under the pretense of a "mercy killing."