Massachusetts ? A college student upset about a failing grade has been accused of following his professor home and stabbing her in the neck.

Nikhil Dhar, 22, pleaded not guilty Friday to charges of armed assault with intent to murder and assault and battery with a dangerous weapon. He was held without bail pending a hearing Wednesday.

Mary Elizabeth Hooker, an assistant professor of clinical lab sciences at the University of Massachusetts-Lowell, told police that Dhar approached her at her home and wanted to talk about “not obtaining a passing grade in her class,” Cambridge police officer Edward Frammartino wrote in his report. She offered to meet him at a coffee shop, but Dhar “became very irate and abusive towards her.”

Dhar dragged her out of the house, hit her and slashed her neck, according to the police report.

Cambridge police officer Thomas Maldonado, who arrested Dhar, wrote in his report that Dhar told him “he went to his professor’s house to talk with her about his grade.”

Hooker was hospitalized with a stab wound to the neck.