A Waterbury man was killed in an accident in Ridgefield early yesterday morning.  Ridgefield Police responded to Route 7 near Stonehenge Road shortly after 4am and determined that two vehicles collided head on.  Both drivers had to be extricated from their vehicles.  20-year old Jose Miguel Guillen-Hernandez was pronounced dead at the scene.  44-year old Karol Mora of Ridgefield was transported to the hospital for evaluation.  Route 7 was closed until about 10am.  The investigation is ongoing.  Ridgefield Police are asking anyone who may have witnessed the accident to contact Capt. Shawn Platt or Lt. Brian Durling at (203) 438-6531.