PAWLET, Vt. — Police on Friday arrested a 23-year-old man with a history of mental health issues in the shooting deaths of his father, stepmother, and stepbrother, a crime that has badly shaken this small town in western Vermont.

A New York man has been arrested and charged for the murders of his father, stepmother and 13-year-old stepbrother in Vermont, state police said.

Brian Crossman Sr., 46, his wife Erica (Pawlusiak) Crossman, 41, and Erica’s son and Brian’s stepson, Colin Taft, 13, were found dead in their Pawlet, Vt., home early morning on Sunday, Sep. 15, the Vermont State Police said in a statement earlier this week.

Brian Crossman Jr., 23, of Granville, New York, faces three counts of aggravated murder in the fatal shootings of his father, stepmother and stepbrother on Sept. 15.

The suspect, who relatives said had mental health disabilities, was spending the weekend with his father and stepmother while his mother was out of town, according to police.