WOBURN, Mass. (AP) A Massachusetts man charged with fatally stabbing a University of New England student at a public library and injuring a man who came to her aid has been found not criminally responsible because of his mental illness.

Jeffery Yao was sent to a state mental health facility by Middlesex Superior Court Judge Kathe Tuttman after a one-day jury-waived trial Wednesday.

Authorities say the 27-year-old Winchester man stabbed 22-year-old Deane Stryker 20 times with a 10-inch hunting knife in the Winchester public library in February 2018.

His attorney says he was a paranoid schizophrenic who was hearing voices at the time.

Stryker was studying at UNE to become a doctor.