Cal Fire personnel and Lake County sheriff's deputies were investigating a man's death Thursday night in the Mendocino National Forest, a Cal Fire dispatcher said.

The body of man in his 40s, possibly a hiker, was located off Bartlett Springs Road near Pinnacle Rock in Lake County, the dispatcher said.

Family members reported an emergency around 6:25 p.m. but could not be reached for more information, she said.

The Sonoma County Sheriff's helicopter, Henry 1, and a Cal Fire helicopter assisted in locating the body.

Investigators were at the scene at 8:30 p.m.

The Lake County Sheriff's Office could not be reached for comment.