Man who was reported missing has been found dead in NE Montana MTN and last updated 2021-07-28 18:27:08-04 GREAT FALLS â Kevin Olson, who was reported missing on Monday, July 26, has been found deceased. A Missing/Endangered Person Advisory had been issued on Monday evening. The Sheridan County Sheriff's Office said that Olson's body was found at about 9:40 a.m. on Wednesday, July 28, by officers using an airplane and cell phone location data to search for him. The Sheriff's Office says that Olson was in a motorcycle crash on Highway 5 West, just west of Plentywood, and was found dead at the scene.