BUENA VISTA, Colo. (AP) — A man climbing Colorado’s Mount Princeton has died after falling about 140 feet.

The Chaffee County Sheriff’s Office says 31-year-old Matthew Wayne Lackey of Boulder was climbing a rock face with other people on Monday afternoon when a large boulder he was holding onto came loose, causing him to lose his balance. He fell about 40 feet to the ground below and then fell another 100 feet down a rocky slope on the mountain, which rises over 14,000 feet.

The sheriff’s office says Lackey and his companions were not using any climbing equipment.

A medical helicopter was called to the area but Lackey was pronounced dead at the scene.

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