A New Fairfield man has been charged for a fatal stabbing that took place over the weekend.  State Police say 59-year old Patrick Griffin stabbed a Sandy Hook man in the chest during an assault at Griffin's Hillview Drive East home late Saturday night.  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.  Griffin has been charged with manslaughter and was held in lieu of $1 million bail for arraignment today.