I think from I see and understand it looks like a case lack of Safety Standards in construction building where the bird was working, or may be Heat Stroke for working in Extreme Climatic conditions. Or be a Victim to Demolition Notice of his Nest...

Strange but True.

IMI - The Screen Behind The Mirror
"I object to violence because when it appears to do good, the good is only temporary; the evil it does is permanent."

"The best way to destroy an enemy is to make him a friend."