The Dauphin County district attorney’s office has released footage of a police officer fatally shooting an unarmed motorist in the back in February as he lay face-down on the ground. Lisa Mearkle, 37, of Hummelstown police, is seen shocking 59-year-old David Kassick with a Taser, before shooting him in the back. Mearkle, who was cleared of murder charges on Thursday, says she feared for her safety

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