WELD COUNTY, Colo. — The six workers who died at a Keenesburg dairy farm in August died from exposure to a toxic gas, the Weld County Coroner's Office announced Thursday.

Six people, including a high school student, died in what Weld County authorities initially called a “dairy accident” at Prospect Valley Dairy in Keenesburg on Aug. 20.

The victims were identified as Oscar Espinoza Leos, 17, of Nunn; Alejandro Espinoza Cruz, 50, of Nunn; Jorge Sanchez Pena, 36, of Greeley; Carlos Espinoza Prado, 29, of Evans; Ricardo Gomez Galvan, 40, of Keenesburg; and Noé Montañez Casanas, 32, of Keenesburg.

Seventeen-year-old Oscar Espinoza Leos was a student at Highland High School in Ault and the son of Alejandro Espinoza Cruz. Oscar was helping his father out before returning to school, sources t

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