A 44-year old Connecticut man has been arrested for operating under the influence in a fatal accident on I-84 in Southbury Friday morning.  Troopers responded to the area of exit 16 westbound shortly before 8am on a report of a three vehicle accident and determined that Kyle St Denis of Collinsville was at fault.  A vehicle with a flat tire was pulled off to the right shoulder, with a tow truck behind it. St Denis hit both vehicles, pushing the disabled car into the tow truck operator.  The pedestrian was transported to the hospital for treatment of minor injuries.  St Denis was transported to the hospital for minor injuries, but declined medical attention.  He exhibited signs of intoxication and failed field sobriety tests.  A passenger in his vehicle was pronounced dead at the scene.  The passenger was not immediately identified, pending notification of next of kin.  St. Denis was charged with Operating a Motor Vehicle Under the Influence of Drugs/and or Alcohol, and Failure to Maintain a Proper Lane.