(Aloha, OR)  --  One person is dead and at least six others are injured, following a seven-vehicle crash on Tualatin Valley Highway in Aloha.  The Washington County Sheriff's Office says the crash happened last night at the highway's intersection with Southwest 185th Avenue, when a truck pulling a trailer plowed into two lanes of stopped traffic.  Deputies say the crash killed a 20-year-old Hillsboro woman, but her name hasn't been released.  Firefighters treated at least a half-dozen people at the scene.