A 19-year-old Sherborn resident accused of stabbing his father with an arrow last Sunday has been found competent to stand trial, a medical evaluator determined during a hearing Wednesday in Natick District Court.

The evaluator reported no signs of acute mental health issues during an interview with Gavin Blalock and concluded that he was aware of the charges against him. As a result, the court proceeded with a detention hearing without ordering further competency evaluations.

Blalock faces charges of assault with intent to murder and two counts of assault and battery causing serious bodily injury. He entered not guilty pleas on Monday. Prosecutors presented several exhibits during the hearing, including the 911 call made after the incident and the police report. The presiding judge briefly paused proceedings to review these materials.

Blalock remains held without bail pending a decision expected Wednesday afternoon regarding his continued detention on dangerousness grounds.

According to Sherborn police, the stabbing occurred around 1:15 p.m. Sunday at a residence on Prospect Street. Officers found Blalock seated on the front steps, visibly distressed and holding his head in his hands. Inside the home, they discovered Jerry Clews, 51, lying on the floor with multiple stab wounds. His wife and three daughters were administering first aid. Clews was transported by ambulance and airlifted to a Boston hospital, where his condition remained undisclosed as of Wednesday.

Investigators reported that Blalock told officers the altercation began with an argument about a computer in the basement, after which Clews allegedly charged at him. Blalock said he feared for his life and used an arrow in self-defense. Officials noted that Blalock was initially very distraught and tearful during his statement.

Blalock is Clews’ stepson and had moved into the family home approximately three weeks prior to the incident. Previously, he had been living with relatives in New Hampshire but left following undisclosed issues. The investigation remains ongoing.