Kauai police responded to a fatal crash Sunday afternoon.  KPD and fire crews responded to Kaumauali’i near mile-marker 6 just before 3 pm after a 66-year-old man rear-ended a Nissan Sentra with his Toyota Tacoma.  The 62-year-old driver of the Sentra and his passenger was uninjured.  The driver of the Tacoma, however, lost control and rolled into a ditch.  He was pronounced dead at the scene.  The driver was identified as 62-year-old Ronald Britton.  It was the fourth traffic-related fatality on Kauai this year.