Twin brothers have been combing the shoreline for at least a week as authorities search for the body of a University of a New Hampshire sophomore who disappeared Oct. 9. Perry and Conrad McKinney, 70, said they feel compelled to assist in the search for 19-year-old Elizabeth ‘‘Lizzi’’ Marriott of Westborough, Mass. The Portsmouth Herald reported that Perry McKinney runs the boat launch at Peirce Island for the city of Portsmouth.
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