A western Pennsylvania man has died in a tractor accident at his family farm.

The Indiana County coroner’s office says 71-year-old Donald James Burley was mowing a field at his Pine Township farm when the tractor overturned and pinned him underneath at about 3 p.m. Sunday.

Coroner Michael Baker says a passer-by alerted authorities, but Burley was pronounced dead at the scene about 45 minutes later.