These are the big mountains... therefore one must carry the right kind of gear for the current conditions, which are prone to change drastically in a short period of time. Essential gear would be an ice axe and crampons or micro spikes.
They have to be carried in hand/worn on shoes-boots, for immediate use, and knowing how to arrest oneself beforehand is critical.
Also, using the buddy system is important, for two heads making decisions (safe route selection/go forward - go up - go back - go down/etc.) are better than one.
Sad death but preventable.
Sounds like a Monday on my driveway.