The B.C. Coroner's Service says Richard Collier and three other people were climbing Mount Geikie in Mount Robson Provincial Park, a mountain about 3,300 metres (10,820 feet) in altitude, about five kilometres west of the Alberta border.
Collier was in the lead when part of the rock face gave way and all four climbers fell.
Collier was killed within minutes of the accident and two other members of the party were injured.
The other climbers were rescued and Collier's body was taken off the mountain by search-and-rescue technicians.
Collier ran as an NDP candidate for Calgary-Glenmore in the 2012 provincial election. A former literature professor at Mount Royal University, he had climbed 1,350 mountains and cycled the circumference of the continental United States, his NDP profile stated.
In an interview with the Calgary Sun in March of 2012, Collier said he was most proud of "exploring thoroughly most of Alberta's magnificent mountain and prairie wildlands, while simultaneously working for their responsible use and preservation."
A United Church supporter, Collier served with social justice, environmental and labour groups such as the Canadian Parks and Wilderness Society, his profile adds.
It was the second climbing death in B.C. this month after a 52-year-old man from 108 Mile House died in a fall on Mount Rogers in Glacier National Park last week.
Those who knew Collier reacted to his death on Twitter.
With files from the Canadian Press.