Good Lord!,
This is not the way that I would like to exit this world, the ultimate insult to a veteran electrician.
It seems to me that there has been a real break-down in communication in this case.
But, not wishing to kick a guy when he is down, I can't help but think, that even though he was working alone in a roof space, he should have told someone where he would be working and what time he would be out of the roof.
Surely someone at the store must have known that he was working up in the roof.
Would there not be a step ladder or even a lead-light cord near the access way into the roof space?.
The need for a Plan B, if you work alone, is very important, in case something does go wrong.