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E! News has learned that although the autopsy examination is complete, the Deputy Medical Examiner has "deferred" the That '70s Show star's final cause of death pending results of additional tests and tissue studies.
According to the Los Angeles Coroner's office, "We are probably looking at approximately 6-8 weeks before the case will be closed. In the interim, we are unable to comment further until all of the results have been received and the case officially closed by the Coroner."