A 23-year-old Yorktown man is in the Westchester County Jail after state police say he stabbed a 28-year-old male from Mahopac after an overnight fight at PJ's Bar, located on Route 6 in Somers, escalated. State police from the Somers barracks charged James P. Nardella of Yorktown Heights with assault in the first degree, a Class B felony, on Sunday.