A fourth firefighter died from burns after he and several colleagues were overwhelmed by a fast-moving wildfire near the Colorado-Utah border last month, authorities said Saturday.

Nathan Matthews, 43, died Friday, the federal Department of the Interior said in a statement. He was from Lincoln, Nebraska.

“This is another heartbreaking loss for our wildfire family,” said U.S. Wildland Fire Service Chief Brian Fennessy.

Matthews’ death came nearly a month after he and other firefighters became involved on June 27 in what is known as a fire, a situation in which the fire spreads and closes all escape routes. They were part of a Helitack team (a group that is dropped by helicopter into remote areas to try to quell new, rapidly expanding fires) that had been deployed to Mesa County, Colorado, west of the city of Grand Junction.

Firefighters deployed tent-like emergency shelters to try to protect themselves from the flames, authorities said, but three firefighters died at the scene: Emily Barker, 38, Nick Hutcherson and Sydney Watson, 26.

Matthews and another were taken for medical treatment. There were no immediate updates on the condition of the other injured firefighter.

Watson, Hutcherson and Barker were honored at a memorial service earlier this month. Memorial arrangements for Matthews have not yet been announced.

The western United States has been dealing with dozens of large fires this summer. Months of dry weather, a record lack of snow in some areas, heat waves and erratic winds have contributed to the fires.

Firefighters were preparing Saturday for the possibility of worsening fires in Oregon, where a fire near Bend was of particular concern because of its proximity to people.