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The six individuals who died at a Colorado dairy farm in August have been uncovered to poisonous hydrogen sulfide fuel, authorities mentioned on Thursday, citing autopsies and toxicology stories on the deceased.
In keeping with the Occupational Security and Well being Administration (OSHA), publicity to hydrogen sulfide fuel at “very excessive concentrations can shortly result in demise.”
The post-mortem stories didn’t point out the circumstances of the deaths.
Hydrogen sulfide is colorless, however has a sulfurous odor, just like rotten eggs. OSHA warns that those that have breathed in sufficient hydrogen sulfide to turn into unconscious however survive can nonetheless wrestle with long-term well being results, comparable to complications and poor consideration span.
SIX DEAD IN DAIRY ACCIDENT IN RURAL COLORADO PLAINS AREA, OSHA INVESTIGATING
An indication stands at Prospect Ranch exterior of Prospect Valley Dairy east of Keenesburg, Colo., on Aug. 21, 2025. (Chris Bolin/Denver Publish by way of AP, File)
The deceased have since been recognized as Ricardo Gomez Galvan, Noe Montañez Casañas, Carlos Espinoza Prado, Jorge Sanchez Pena, Alejandro Espinoza Cruz and Oscar Espinoza Leos, who was simply 17 years outdated on the time of his demise. Cruz was the daddy of Leos and Prado. The boys have been additionally associated to Pena via marriage, in accordance with Jolene Weiner, chief deputy coroner for Weld County.
The dairy at Prospect Ranch the place the six individuals died was positioned in a rural space close to Keenesburg, Colo., which is lower than 40 miles northeast of Denver.
When the deaths have been reported in August, authorities shortly assessed that fuel publicity was the doubtless wrongdoer. It was then as much as investigators to find out what sort of gases presumably performed a job of their deaths.
“We’re investigating these deaths because the attainable consequence of fuel publicity in a confined area,” Weiner mentioned on the time.

A Colorado dairy farm confined area accident left six employees useless in August. (iStock)
MIDWEST BIOFUELS PLANT EXPLOSION, BUILDING COLLAPSE LEAVES 3 DEAD, INCLUDING 2 CHILDREN
In late August, the our bodies of six individuals — which have since been recognized as 5 males and one teenager — have been found after an obvious accident. Southeast Weld Fireplace Safety District officers mentioned crews have been dispatched to a “confined area” rescue, the place the our bodies have been discovered.
The deaths shocked the neighborhood, which shortly sprung into motion to assist the surviving households of the deceased by organizing fundraisers, comparable to dances and automobile washes. A number of church buildings additionally organized memorial occasions.

Dairy cattle feed at a farm on March 31, 2017, close to Vado, New Mexico. (Rodrigo Abd, File/AP Picture)
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“Persons are in shock. All people within the ranching and dairy neighborhood is aware of it’s troublesome, arduous work and there are accidents,” mentioned Rev. Thomas Kuffel, a priest at Catholic church buildings together with Holy Household in Keenesburg. “However that is very international to them, in that accidents are usually one or two individuals.”
Fox Information Digital reached out to OSHA for remark, however a message indicated that they might not be capable to reply throughout the authorities shutdown.
The Related Press contributed to this report.
