An 18-year-old North Andover man is accused of killing his therapist.

Police say Thomas Belanger stabbed 53-year-old Diruhi Mattian in the teen-ager's apartment Wednesday, then attempted to slit his own throat.

Mattian was taken to Lawrence General Hospital, where she was pronounced dead.

The Eagle-Tribune of Lawrence reports that Mattian, a Wilmington resident, was a licensed psychotherapist and worked for a Lawrence-based agency that helps families in crisis.

North Andover Police Chief Richard Stanley says Belanger spent the night under police guard at the hospital and is expected to be arraigned Thursday on a murder charge.