A difficult new route, the northwest buttress, was climbed by a 13-person team in 1976. Three Americans, John Roskelley, Jim States and Louis Reichardt, summitted on 1 September. The expedition was co-led by Reichardt, H. Adams Carter (who was on the 1936 climb,) and Willi Unsoeld, who climbed the West Ridge of Everest in 1963. Unsoeld's daughter, Nanda Devi Unsoeld, who was named after the peak, died on this expedition. She had been suffering from "diarrhea and flare-up of an inguinal hernia, which had shown up originally on the second day of the approach march", and had been at for nearly five days.