A New Fairfield man has pleaded not guilty to a charge stemming from a fatal stabbing earlier this month.  59-year old Patrick Griffin was charged with manslaughter and entered the plea at a pre-trial hearing on Monday. He remains held on bond for his next hearing, July 11th. Griffin allegedly stabbed a Sandy Hook man in the chest during an assault at his Hillview Drive East home.  65-year-old James Knapp was rushed to Danbury Hospital, where he was later pronounced dead.  Knapp was the father of Newtown Legislative Councilman Ryan Knapp.