WINCHESTER, Mass. (AP/WHDH) — Police say a man 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 morning when 23-year-old Jeffrey Yao stabbed her with a 10-inch knife.

Police say there is no motive determined yet.

Ryan said the woman headed toward the door and a number of people came to her aid, including a 77-year-old man who was also stabbed. Ryan said the man suffered non-life threatening injuries.

The 22-year-old victim was home from college for the weekend, according to friends, and was studying at the library.

Yao is charged with murder and will appear in court Monday. A phone number for him could not be found.

(Copyright (c) 2022 Sunbeam Television. The Associated Press contributed to this report. All Rights Reserved. This material may not be published, broadcast, rewritten, or redistributed.)

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