VENTURA COUNTY, Calif. -

Authorities said the death of a Southern California firefighter during a camping trip was an accident.

The Ventura County coroner said Monday's autopsy concludes that 36-year-old Mike Herdman died of blunt force injuries. Herdman was camping with a fellow Arcadia firefighter in Los Padres National Forest northwest of Los Angeles when he vanished on June 13.

Herdman's dog ran off and he was last seen chasing after it - barefoot and wearing only shorts and a T-shirt. An air and ground search ended last Friday when Herdman's body was found on the side of a steep canyon. He was less than a mile from his campsite but more than 1,000 feet higher up. His dog had been located earlier.