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Questions swirled Friday about the possible role prescription medications may have played in the death Thursday of pop idol Michael Jackson, people close to him said.

His autopsy was completed, but further tests must be carried out before the cause of death can be determined, a spokesman for the Los Angeles County Coroner said.

Craig Harvey said the tests would take four to six weeks, after which "we anticipate being able to close the case and issuing a final cause of death." Among the tests to be carried out, he said, are neuropathology (brain) and pulmonary (lung) tests. Read full article »

CNN's Alan Duke and Drew Griffin contributed to this report.

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