The firefighter was killed Thursday, the forest service said in a brief statement
. The cause of death is under investigation, it said, and the firefighter’s identity was withheld pending the notification of next of kin.
“Our deepest sympathies are with the family, friends and fellow firefighters during this time,” the forest service said in a brief statement on Twitter.
The El Dorado Fire was started by a “smoke-generating pyrotechnic device” used at a party over Labor Day weekend in El Dorado Ranch Park in Yucaipa, about 70 miles east of Los Angeles, according to Cal Fire investigators
Fire officials told CNN at the time that those involved were cooperating with fire investigators.
As of Thursday night, the El Dorado Fire had scorched more than 19,000 acres
and was 66% contained.