I think this is quite a widespread phenomenon, and it seems that many people, even those with no spiritual awareness, have smelled something sweet around a death.
I personally smelled it when I was present at my grandmother's death. I remember reading somewhere that there is actually a scientific reason for this. Apparently it is the smell the blood makes in the body when it solidifies after death, though this doesn't explain why people smell it as a pre-cursor to death when they are not physically present with the person who is about to pass over.
Strangely, I was expecting to smell it when I witnessed my father's death, but did not. Then I realised that he had been on a lot of blood thinning drugs so maybe the blood didn't react the same way after death and therefore didn't create the characteristic smell.
Love and Light
Jeremy