GREELEY — 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. Read more on Colorado Springs Gazette