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Idaho State Police are investigating a fatal crash that occurred Wednesday on Interstate 15 north of Idaho Falls.

According to Idaho State Police, Norman Hill, 78, of Alberta, Canada, was driving southbound in 2014 Monaco Dynasty Motorhome when the vehicle went off the right shoulder and rolled. The crash occurred about about 1:53 p.m. at milepost 178, a couple miles south of Spencer, Idaho.

Hill succumbed to his injuries at the scene. Hill's passenger, Elanor Hill, 79, of Alberta, Canada, was transported by air ambulance to Eastern Idaho Regional Medical Center in Idaho Falls, and her condition is unknown. It is also unknown if seatbelts were worn.

The crash is still under investigation by the Idaho State Police. The southbound lanes of the interstate were closed for several hours following the crash.