GREELEY, Colo. — One of three maintenance workers injured in an oil site fire in northern Colorado last week has died.

The Weld County coroner’s office says 61-year-old George Cottingham of Greeley died Tuesday night.

Cottingham and two other maintenance workers were burned at a PDC Energy site about 10 miles east of Galeton.

The Greeley Tribune reports the workers were doing maintenance for a DCP Midstream pipeline and didn’t work for PDC.

Authorities are still investigating how the fire started.