Police say a group therapy session turned violent in southern New Jersey.
Authorities have charged 32-year-old Ryan McCausland of Collingswood with aggravated assault and weapons offenses.
Berlin police tell the South Jersey Times McCausland punched a counselor in the face on Tuesday and scuffled with another member of the group who tried to subdue him.
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Police say McCausland brandished a pocket knife and stabbed 46-year-old Raymond DiDonato in the back and stomach.
Another member of the group disarmed McCausland.
DiDonato underwent surgery.