PORTLAND – Authorities said a 63-year-old man had died while climbing Oregon’s third-tallest peak.

The Oregonian/OregonLive reported hikers found Tom Shakespeare face down and unresponsive Tuesday morning on the South Sister Climber Trail.

The Deschutes County Sheriff’s Office said deputies were investigating but that the death did not appear to be suspicious.

Shakespeare was at about 8,417 feet, or approximately 1,941 feet from the mountain’s summit.

Deputies said he seemed to have been hiking by himself.

Hikers who found Shakespeare performed CPR but weren’t able to revive him, deputies said.

Deschutes County Sheriff’s Office Lt. Bryan Husband said the man was an experienced hiker.