I'll defer to Hillbilly's take on the topic. I can understand his desire to not get to specific about the incident. I had missed my attention that this was something with which he was personally involved.
No sane person enjoys hearing of anothers' misfortune, and such seems to happen to folks without any rhyme or reason. Fate? Karma? More like the Devil rolling the dice, it seems.
I recall one job where the two-man roofing crew consisted of one responsible person, and one 'loose cannon.' Ironically, it was the 'professional' who died in a fall - having been caught by a gust of wind at the very instant as he transferred his tie-line from one support cable to another.