Orion Krause right, stands with his attorney Edward Wayland at Krause’s arraignment in Ayer District Court in Ayer, Mass., Monday, Sept. 11, 2017. Krause, of Rockport, Maine, was ordered held without bail at Bridgewater State Hospital pending a competency hearing at his arraignment on murder charges Monday in Ayer. 

ROCKPORT (AP) — The father of a Maine man accused of killing three family members and a caregiver says he doesn’t understand how his son could have committed such violence.

Orion Krause is charged with killing his mother, grandparents and their caretaker at his grandparents’ Massachusetts home last week.

Alexander Krause tells The Boston Globe that his 22-year-old son was a “stellar student.” Krause says the killings underscore the need to “pay more attention to mental health,” but declined to elaborate.

Krause tells the newspaper that there are “so many unanswered questions.”

Orion Krause, who recently graduated from Oberlin College, is being held at Bridgewater State Hospital pending a competency hearing.

A candlelight vigil for his mother, 60-year-old Elizabeth Krause, will take place Thursday evening in Rockport, where she and her son lived.