The passenger in a car that plunged into the Housatonic River has died and the accident is under investigation. State Police responded to Schaghticoke Road in Kent on Friday on a report of a driver veering off the road, rolling down a steep embankment and dropping nose first into the river.  The driver was able to free herself while the front seat passenger remained inside fully submerged. Dive teams responded and freed the passenger, who was transported to Sharon Hospital.  24-year old Dillon Miller of Dover Plains was later pronounced dead.  No other vehicles were involved.  State Police say enforcement action against the driver, 24-year old Alexis Caron, of the same Dover Plains address, is pending.