Alex Lowe, 40, regarded by some as the world's best mountain climber, as a result of an avalanche, Tuesday, as he scouted routes on the upper slopes of Tibet's 26,291-ft. Shishapangma, the world's 14th-highest peak. David Bridges, 29, a cameraman, is also presumed dead . . . Robert "Gorilla Monsoon" Marella, the 6'6", 400-lb. pro wrestler who became a TV announcer and later president of the World Wrestling Federation, Wednesday, of complications from a recent heart attack. He was 62.