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PITKIN COUNTY, Colo. — A Denver man who was hiking a 14,026-foot mountain near Aspen is overdue, according to the Pitkin County Sheriff’s Office.

The sheriff’s office said that about 6 p.m. Sunday, it received information about an overdue hiker on Pyramid Peak in the Maroon Bells-Snowmass Wilderness.

Neil James Brosseau separated from his hiking party around 2 p.m. Sunday near the top of Pyramid Peak and had not returned.

“This behavior was uncharacteristic for the overdue party and the hiking party alerted authorities. Due to the difficulty of terrain and time of report, the Pitkin County Sheriff’s Office and Mountain Rescue Aspen planned for search efforts the following day,” the sheriff’s office said in a press release.

Crews searched for Brosseau from the ground and the air on Monday.

He is described as a 66-year-old who is 5 feet 10 inches tall and weighs between 165 and 170 pounds. He has blond hair and blue eyes. He is an experienced outdoor enthusiast.

The search continued Tuesday.

Those with information about Brosseau’s whereabouts should contact the sheriff’s office by calling 970-920-5310 or emailing tips@pitkinsheriff.com.