Apparently, we had a diving fatality off of Venice Beach, FL this weekend:
http://www.scubaboard.com/showthread.php?threadid=68816&s=
http://www.scubaboard.com/showthread.php?threadid=68816&s=
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My father was diving in the 60's and told me how when his air ran out he could just swim up :11: but by then his tank would be boyant so it wasnt a problem on the surface :11:String:BCs are a relatively new diving invention. Pre ABLJ days divers dived by simply weighting themselves correctly for the depth they want to go to. Its unusual these days but certainly was normal in the past.
As for preventable/alone - theres no 100% guarantee that someone else may have solved the problem. You could equally argue she should have carried a redundant air source for solo diving.