(Onalaska, WA)  --  State troopers say they've arrested a man on DUI charges after a crash that killed three people and injured three others in Lewis County, Washington.  The Washington State Patrol says a van driven by Joseph Rogerson collided with an oncoming SUV on S-R 508 near Onalaska late Monday night.  Police say an 18-year-old and a 13-year-old who were in the SUV died at the scene, and another 18-year-old died yesterday at a hospital.  Rogerson pleaded not guilty yesterday to a charge of driving under the influence.