Investigators were executing search warrants to see if he is linked to additional stabbings since his release from prison on May 23 , a law enforcement official said . NEW : Authorities apprehend suspect in stabbing , 27-year-old Daniel St. Hubert . The man was taken to a hospital for treatment of his injuries. Police say St. Hubert was out on parole tied to domestic assault since May 23 . NEW : Mayor says injured 7-year-old girl `` is doing much better '' Prince Joshua `` PJ '' Avitto , 6 , was killed in the stabbing .
NEW : Authorities apprehend suspect in stabbing , 27-year-old Daniel St. Hubert . The man was taken to a hospital for treatment of his injuries. Police say St. Hubert was out on parole tied to domestic assault since May 23 . NEW : Mayor says injured 7-year-old girl `` is doing much better '' Prince Joshua `` PJ '' Avitto , 6 , was killed in the stabbing .