From the Seattle Times:
The three firefighters killed in a wildfire near Twisp, Okanogan County, last week died from smoke inhalation and “thermal injuries,” or burns, Okanogan County Coroner Dave Rodriguez said Friday.
The firefighters were driving up a steep gravel road and crashed down a 40-foot embankment, where the fire consumed them. The manner of death was classified as accidental.
Those killed Aug. 19 were Richard Wheeler, 31, Andrew Zajac, 26, and Tom Zbyszewski, 20.
