A 38 year-old Seattle man was found dead Wednesday after a fall while hiking at a mountain lake near North Bend.

The man, whom media reports identified as Seattle doctor Peter Choi, had been hiking at Mason Lake, located in the Snoqualmie National Forest about 12 miles east of North Bend.

According to King County Sheriff’s reports, Choi fell to his death down a very steep slope on the trail to Mason Lake.

Choi was reported missing by his sister at about 11 p.m. Tuesday, June 29, after he failed to return from a one-day camping trip. He was camping alone, accompanied by his dog.

Choi’s car was found at the Mason Lake trailhead, and his body was spotted by the crew of the sheriff’s Guardian One helicopter about 7:30 a.m. Wednesday.

The King County Medical Examiner is investigating the cause and manner of death.