Ahhh, "Guadalcanal Diary" - I think it said the first casualty was a Marine who sliced open his hand while trying to get at a coconut.
Great book - read it 40 years ago and reread it back in the 80's.
This author is now considered to be the definitive historian of the battle. I have his book on my shelf and it’s on my ‘books to read’ list.
http://en.wikipedia.org/wiki/Richard_B._Frank
The beginning of the end for the Jap Empire. Semper Fi, Marines.
TC