SISTERS, Ore. -- An 82-year-old Sisters man was killed and a passenger was seriously injured Wednesday afternoon when their pickup truck left Wilt Road northeast of Sisters and struck a tree, Deschutes County sheriff's deputies said.

Deputies were called around 2:35 p.m. to the single-vehicle crash on Wilt Road, east of Fair Mile Lane, DCSO Public Information Officer Jason Carr said.

The white 2018 Ford F-150 was heading east on Wilt Road when it left the road on the northbound shoulder and struck a Ponderosa pine tree.

The driver, Frank Halvorsen of Sisters, died the crash scene, Carr said.

His 81-year-old female passenger sustained serious injuries and was taken to St. Charles Bend by medics from the Sisters–Camp Sherman Rural Fire Protection District.

The Deschutes County Sheriff’s Office was assisted at the scene by the fire district and the Deschutes County Road Department.

Carr said the cause of the crash remains under investigation.