Jeff Conaway The LA County Coroner is conducting an autopsy on "Grease" star Jeff Conaway� this afternoon ... TMZ has learned.According to our sources, the coroner is expecting the results to be inconclusive and a cause of death will not be able to determined until toxicology results are in ... which take about 4-6 weeks.Conaway passed away yesterday at the age of 60 after he had reportedly fallen into a coma earlier this month.
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