ELDORADO SPRINGS, Colo. -- A 25-year-old Boulder, Colo., climber died in a fall at Eldorado Canyon State Park Thursday evening.

The man had just finished the "Rincon Route" at about 6:15 and was rappelling down a cliff when he fell about 20 feet and landed on his head.

His climbing partner ran to the state park ranger’s office and reported the accident. Firefighters from the Cherryvale Fire Protection District, and rescuers from the Rocky Mountain Rescue Group responded to the accident scene.

Rescuers said he was not wearing a climbing helmet.

The man was pronounced dead as he was being evacuated from the canyon.

Eldorado Canyon is a popular climbing destination southwest of Boulder.