(AP) — Sheriff’s officials have identified a south-central Nebraska farmer killed this week in a grain bin accident.

Clay County Sheriff Jeff Franklin said 66-year-old Alan Watson, of rural Fairfield, was engaged in a routine activity when he died inside the 1 1/2-story grain bin on Tuesday. Investigators say Watson was using an auger to move corn out of the bin and into trucks when he died. The bin was about half-full of corn at the time.

Franklin says Watson’s wife and a truck driver were outside the bin when they noticed no grain was coming through. They began looking for Watson, but could not find him, then called for rescue crews.

Franklin says it’s possible Watson’s death resulted from a medical issue.