Lisa Robin Kelly — Death Still a Mystery

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Lisa Robin Kelly
“s autopsy is complete … but cause of death is still unknown, our sources has learned.

A spokesperson for the L.A. County Coroner”s Office tells our sources, the autopsy was finished Saturday — but the cause of Lisa”s death won”t be known until the toxicology results are in … which could take weeks.

As our sources previously reported … The “That 70″s Show” actress died in her sleep Wednesday night while staying at a treatment center for alcohol abuse. A few days prior she had been admitted to the hospital by her boyfriend with a BAC of .34 (borderline fatal).