Another climber at the park called 911 around 7:45 a.m. to report they saw someone fall, according to Barb Maynes with Olympic National Park.
Maynes says Richard "Grey" Liston of Portland was climbing with a companion near the summit on the east face of the mountain when he fell into an area of rocks and glacier.
One of the witnesses was a paramedic and was able to get to Liston and confirmed he had died.
Using a helicopter, park officials were able to get the body off the mountain by around 8 p.m. Saturday.
Liston worked as an accountant. He was also the drummer and founder of Smash Bandits, a Portland ska band.
"He was an adrenaline junkie, which music gives that to you performing on stage," said fellow band member Dean Farmer. "He also loved climbing. He was always talking about 'I'm going to Three Sisters down here' or 'I'm going to summit this and ski down.'"
Liston founded the band last year.
"He probably wouldn't want us to stop doing the band just because he was gone," said band member Bryce Peltier. "Anytime we tried to maneuver around a Saturday afternoon he would say, 'I'm going to be up on the mountain.'"
"He lived life on the edge," Farmer said. "Sometimes people that do that, you know, they end up leaving us too quickly."
The Associated Press contributed to this story.