NAPA (CBS SF) — A 38-year-old volunteer firefighter from Missouri was identified Tuesday as the driver killed when a water tender careened out of control and rolled over on the steep Oakville Grade, authorities said.

The Napa County Coroner said Garrett Paiz was killed in the crash.

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The crash involving Paiz — a Cal Fire contractor — was reported at 6:50 a.m. in Oakville, just west of state Highway 29 northwest of Yountville. The tender had been involved in battling the Nuns-Partrick Complex Fire burning in northern Napa County.

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cal fire tender crash kpix

Firefighters at the scene of a fatal crash of a water tender truck in Oakville, Napa County, October 16, 2017. (CBS)

“This (the Oakville Grade) is a very, very steep road,” Cal Fire spokesman David Shew said.”The Oakville Grade is the steepest road in Napa County.”

Shew would not speculate if fatigue played a role in the crash.

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“Any incident like this is very tragic,” Shew said. “It effects us (firefighters) personally.”