BOULDER, Colo. (AP) _ A man who had tried several times to climb Mount Everest alone was killed in a fall near the summit, friends say.

Roger Marshall, 45, a British subject who had lived in Boulder for three years, died May 21 while attempting to scale the 29,028-foot Himalayan peak alone and without bottled oxygen, said Mark Springett of Boulder.

Springett and his wife had gone to Everest, which straddles Nepal and China, with Marshall in early April and traveled with him as far as his base camp. A nutritionist who served as Marshall's base camp crew notified friends of his death Tuesday.

In an interview with the Boulder Daily Camera in October, Marshall said climbing with technical gear and bottled oxygen was ''cheating.'' He felt that using bottled oxygen effectively reduced the size of the mountain by several thousand feet.

Lack of oxygen at high altitudes is a danger for climbers who can experience dizziness, hallucinations and loss of judgment.

Marshall spent 15 years as a reporter in Canada and served with the Canadian Mount Everest Expedition before being fired in 1982 over personal and philosphical differences with the expedition leader.