A Wainiha man was killed Friday, when his truck ran off Kuhio Highway in Haena on Kauai and plunged 20 feet off a cliff, landing in the water. A bystander reported the 7:15 a.m. crash to police.  Rescuers found the man unresponsive inside the truck.  Kuhio Highway was closed in both directions for five hours while crews recovered the body and the pickup.  The victim has not yet been identified.