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On August 9, 1955 the ski and mountain guide Fritz Steuri was together with the married couple Fuhs from Köln on their way to ascend Gross Grünhorn, 4044 meter. The tour went over the fore-summit Grünegghorn 3860 meter and down towards the cool. The narrow snow ridge broke and all three fell to their death. See this.
Rubi, Rudolf: Im Tal von Grindelwald, Band II, Verlag Sutter Druck, Grindelwald, 1986.