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Police officers from across the country gather for the funeral of New York Police Department Officer Wenjian Liu at Aievoli Funeral Home, Sunday, Jan. 4, 2015, in the Brooklyn borough of New York. Liu and his partner, officer Rafael Ramos, were killed Dec. 20 as they sat in their patrol car on a Brooklyn street. The shooter, Ismaaiyl Brinsley, later killed himself. (AP Photo/John Minchillo)

At a funeral for Wenjian Liu, the slain police officer was remembered as one who "believed in the possibility," one who believed he could help make the world and his city safer.
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