He ended up killing four students and injuring two other students and a fellow teacher.
One night in August 1975, 16-year-old Debbie Gama got into an argument with her mother and stormed out of their Erie, Pennsylvania, house.
Sithembiso Gcwenya, 19, was killed, while Sibusiso Mbutho, 19, and Bheki Mnyandu, 18, were both injured.
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In early December 2005, Hagino found out he would no longer be teaching 12-year-old Sayano Horimoto after her parents complained about him.
Hagino did not get along with the sixth grader, and she had mocked him.
Fearing for their safety, the teachers and the principal locked themselves in the library.
When the students started throwing rocks through the library windows, the principal and a teacher opened fire on them.
Teachers and other staff were interviewed, and they determined that Mahto went to the home of teacher Nezma Khatoon.