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This photo provided by Winchester Police Department shows Jeffrey Yao.  Police say Yao approached a woman from behind at a public library near Boston and stabbed her repeatedly with a hunting knife, killing her and injuring an elderly man who came to her aid. Middlesex District Attorney Marian Ryan says the 22-year-old woman was seated at one of Winchester Public Library’s reading rooms Saturday, Feb. 24, 2018 when Yao stabbed her with a 10-inch knife. Police say there is no motive determined yet. (Winchester Police Department via AP)

This photo provided by Winchester Police Department shows Jeffrey Yao. Police say Yao approached a woman from behind at a public library near Boston and stabbed her repeatedly with a hunting knife, killing her and injuring an elderly man who came to her aid. Middlesex District Attorney Marian Ryan says the 22-year-old woman was seated at one of Winchester Public Library’s reading rooms Saturday, Feb. 24, 2018 when Yao stabbed her with a 10-inch knife. Police say there is no motive determined yet. (Winchester Police Department via AP)

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