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A Nassau County police officer was shot dead Tuesday -- the second time in less than a week an officer on the force was killed in the line of duty.
An Emergency Services Unit officer, identified as Arthur Lopez, and another person were fatally shot Tuesday on the Cross Island Parkway on the Queens/Nassau border, sources said. It was unclear whether the other victim was a suspect in the officer's slaying.
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The eight-year veteran officer's death comes one day after the funeral of the other fallen officer, a Nassau highway patrolman who was struck and killed by an SUV on the Long Island Expressway on Thursday.