Deschutes County authorities are investigating a fatal single-vehicle crash northeast of Sisters. Deputies say it happened Wednesday afternoon around 2:30 on Wilt Road, east of Fair Mile Lane. Investigators report a white 2018 Ford F-150 was traveling east when it left the roadway on the north shoulder and struck a Ponderosa pine tree. The driver, 82-year-old Frank Halvorsen of Sisters, was pronounced dead at the scene. An 81-year-old female passenger suffered serious injuries and was taken to the hospital by Sisters–Camp Sherman medics. The Sheriff’s Office says the cause of the crash remains under investigation.