The Concord teen charged in his mother's death will be sent to a mental facility.
A judge ruled David Grow is not guilty by reason of insanity in the death of his mother, Robin Grow.
She was found stabbed to death in their Concord home in February. His father said he had been having delusions about a demon in the weeks before her death.
The state Center for Forensic Psychiatry found Grow was not criminally responsible for the murder, but said he was competent to stand trial.
News 10's Alyssa Fenske was in court for the decision. She will have reaction to the verdict later this evening.