BRINNON — A 12-year-old boy from Silverdale was killed Saturday morning after a log rolled over him at Lower Lena Lake in southeast Jefferson County, the Jefferson County Sheriff’s Office said.

The injured boy died in the Olympic National Forest after his father, Richard Thompson — a doctor — tried to administer CPR, said Joe Nole, chief criminal deputy with the Sheriff’s Office.

Nole declined to release the name of the boy because of his age.

Thompson and his son were on a Boy Scout outing with nine other boys and three other adults, Nole said, and had arrived at the Lena Lake campground in The Brothers Wilderness on Friday night.

Nole said Jeffcom 9-1-1 received an alert that a hand-held emergency beacon had been set off at about 9:20 a.m. Saturday near Lena Lake, about 12 miles south of Brinnon.

The boy and three others had tried to roll a large log into Lake Lena down a slope strewn with boulders, Nole said.

The log started to roll, caught the boy’s jacket and rolled over him, Nole said.

“He had massive head trauma,” he said.

The other Boy Scouts, one of whom was the boy’s 14-year-old brother, ran the roughly half-mile back to their camp to tell the adult group leaders.

Nole said one of the adults ran back to the Lena Lake trailhead, about 3 miles away, to call 9-1-1. Mason County sheriff’s deputies and fire and rescue responded.

The boy’s body is now in possession of the office of Jefferson County coroner Scott Rosekrans, who is also the county prosecuting attorney.

There will be no autopsy, Nole said.

“There’s nothing criminal going on, [nothing] suspicious. It was an accident that happened,” he said.

Reporter Jeremy Schwartz can be reached at 360-452-2345, ext. 5074, or at jschwartz@peninsuladailynews.com.