In a tragic incident at a Colorado dairy farm, six individuals lost their lives in August due to exposure to toxic hydrogen sulfide gas, officials confirmed on Thursday. Autopsies and toxicology reports unveiled the cause of death, according to local authorities.

The Occupational Safety and Health Administration (OSHA) has highlighted the dangerous nature of hydrogen sulfide, stating that high concentrations of the gas can swiftly prove fatal.

The autopsy findings, however, did not provide details on the circumstances surrounding the deaths.

Hydrogen sulfide is a colorless gas known for its distinctive sulfurous odor, reminiscent of rotten eggs. OSHA advises that survivors of hydrogen sulfide exposure may suffer from long-term health issues, including headaches and impaired concentration.

A sign was seen at Prospect Ranch near Prospect Valley Dairy, located east of Keenesburg, Colorado, on August 21, 2025. (Photo: Chris Bolin/Denver Post via AP, File)

The victims have been identified as Ricardo Gomez Galvan, Noe Montañez Casañas, Carlos Espinoza Prado, Jorge Sanchez Pena, Alejandro Espinoza Cruz, and Oscar Espinoza Leos, who was only 17 at the time of his death. Cruz was the father of Leos and Prado, and the men were related to Pena through marriage, as confirmed by Jolene Weiner, chief deputy coroner for Weld County.

The dairy at Prospect Ranch where the six people died was located in a rural area near Keenesburg, Colo., which is less than 40 miles northeast of Denver.

When the deaths were reported in August, authorities quickly assessed that gas exposure was the likely culprit. It was then up to investigators to determine what kind of gases possibly played a role in their deaths.

“We are investigating these deaths as the possible consequence of gas exposure in a confined space,” Weiner said at the time.

A Colorado dairy farm confined space accident left six workers dead in August. (iStock)

In late August, the bodies of six people — which have since been identified as five men and one teenager — were discovered after an apparent accident. Southeast Weld Fire Protection District officials said crews were dispatched to a “confined space” rescue, where the bodies were found.

The deaths shocked the community, which quickly sprung into action to help the surviving families of the deceased by organizing fundraisers, such as dances and car washes. Several churches also organized memorial events.

Dairy cattle feed at a farm on March 31, 2017, near Vado, New Mexico. (Rodrigo Abd, File/AP Photo)

“People are in shock. Everybody in the ranching and dairy community knows it’s difficult, hard work and there are accidents,” said Rev. Thomas Kuffel, a priest at Catholic churches including Holy Family in Keenesburg. “But this is very foreign to them, in that accidents are typically one or two people.”

Fox News Digital reached out to OSHA for comment, but a message indicated that they may not be able to respond during the government shutdown.