Thor Hallingbye was found deceased near Gannett Peak, Wyoming's tallest mountain, Aug. 16. Photos courtesy Sublette County Sheriff's Office

Update: 6 p.m.:  On Monday evening, the Sublette County Sherriff’s Office announced that Hallingbye had been found deceased.

“During search efforts today Mr. Hallingbye was located inside Fremont County. More details will be released when they are available in a joint release between Sublette and Fremont county sheriff,” the release said.

“Our sincerest condolences go out to the family and friends of Mr. Hallingbye,” said the Sublette County Sheriff’s Office.

SUBLETTE COUNTY, Wyo. — Sublette County officials are asking for the public’s help finding 41-year-old Thor Hallingbye, who was last seen near Gannett Peak in the Wind River Mountain Range Aug. 14.

Hallingbye was last seen wearing a red backpack. He is described as 5 feet 7 inches and 125 pounds with brown hair and blue eyes.

Anyone who may have seen him is asked to call the Sublette County Sheriff’s Office at 307-367-4378.

Hallingbye, of Cheyenne, was reported missing Sunday morning after apparently getting separated from his group near Gannett Peak on Saturday, Sublette County Sheriff’s Sgt. Travis Bingham said Monday.

A helicopter crew with Tip Top Search and Rescue was looking for Hallingbye. Rescuers also planned a ground search, Bingham said.

Gannett Peak is a 13,810-foot (4,210-meter) summit in western Wyoming’s Wind River Range. Climbing the glacier-flanked mountain requires a multi-day hike and crossing sometimes treacherous snowpack.

Hallingbye is an anesthesiologist and pain specialist at Cheyenne Regional Medical Center.

Shannon is a Wyoming-raised writer and reporter. She just completed a master's in journalism from Boston University. Jackson shaped her into an outdoorswoman, but a love for language and the human condition compels her to write. She believes there's no story too small to tell nor adventure too small to take.