The article above links to the page for Annapurna, one of the deadliest mountains on earth (40% fatality rate for climbers), which said this:

The second summit team, Alison Chadwick-Onyszkiewicz and Vera Watson, died during this climb. (Vera Watson was survived by her husband, the computer scientist John McCarthy.)[5]

http://en.wikipedia.org/wiki/Annapurna