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This is a turn typical of newspaper and magazine articles. Here is another example from The Independent.
He might angrily protest when Vincent (John Travolta) shows up with an unconscious Mia (Uma Thurman), who has snorted one line too many, but there's never any doubt of him helping his pal through his predicament.
According to Wikepedia the use of ...
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This may look a little strange - and maybe it is by grammar rules - but it is absolutely normal in native English.
Equally weirdly the definite article is just as acceptable and means exactly the same.
If you don't want to write it like that there are plenty of alternatives. The one you gave, plus:
Michael Jackson, unconscious, was rushed...
Michael ...
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