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Lisa Robin Kelly in 2000
© Getty Images / Lisa Robin Kelly in 2000
Lisa Robin Kelly's cause of death remains unknown

WENN

Tragic actress Lisa Robin Kelly's passing remains a mystery after her autopsy failed to uncover a cause of death.

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The "That '70s Show" star passed away at age 43 on Aug. 14 at a rehabilitation facility in California, just two days after she admitted herself to the clinic in a bid to tackle her long-running alcoholism. It was believed the star suffered a fatal cardiac arrest, but a spokesperson for the Los Angeles County Coroner's Office reveals a cause of death is still unknown after an autopsy was completed on Saturday.

The coroner is now awaiting toxicology results, which could take several weeks.