HARTFORD, Mich. (AP) — A 35-year-old Middleville man has died after being buried beneath cattle feed on a dairy farm in southwestern Michigan.

The Herald-Palladium of St. Joseph reports that a 30-foot-high corn silage stack broke loose about 6:30 a.m. Friday on the farm in Van Buren County’s Hartford, southwest of Grand Rapids.

The county sheriff’s office says the man was a sub-contractor for a Grand Rapids company that was at the farm to conduct testing. Another worker found the man buried. He was pronounced dead at a hospital.

The incident is being investigated by the Michigan Occupational Safety and Health Administration.