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Deane Stryker, the 22-year-old woman who died Saturday following a stabbing at Winchester Public Library, "showed great promise as a student doctor who was passionate about medicine and helping others", according to her university's president.

Sometime around 10:30 a.m. Saturday, a man stepped into the quiet of the Winchester Public Library's reading room, approached the unsuspecting woman from behind, and pulled out a 10-inch hunting knife, The Washington Post reported.

Ryan added that another woman, aged 77, was slightly injured in her arm as she was attempting to help the girl amid the violation. The woman's identity was being withheld until her family could be notified, she added.

Authorities have not released the name of the woman Yao is accused of attacking.

Neighbours of Yao interviewed by the Boston Herald said his behaviour had become increasingly erratic in recent years. One neighbor told the newspaper he warned authorities that Yao would kill someone. Reports say Yao attacked her from behind while she was working at a table and stabbed her repeatedly. Jeffrey Yao, 23, of Winchester, was arrested at the scene and has been charged with murder and assault with intent to murder. He was being held without bail and was expected to appear in court Monday.

A group of neighbors reportedly spoke to Winchester police over the summer about the concerns over Yao, and police said they were aware of him and were observing his behavior.

More, Ryan said, would come out when Yao was arraigned.