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Report: Authorities Are Suspicious About Death of 'That '70s Show' Actress TMZ

Both the Los Angeles County Coroner and the Los Angeles County Sheriff are conducting investigations into the cause of actress Lisa Robin Kelly's death, reports TMZ.com.

The story notes that the "L.A. County Coroner never got a call from the rehab facility where Kelly died. A doctor at the rehab facility pronounced Kelly dead at 8:07 a.m. Thursday [Aug. 15, 2013], but we're told the Coroner didn't find out until noon, when an official from the office saw the post on TMZ."

It has been widely reported that Kelly died in her sleep late Wednesday, Aug. 14.

TMZ adds that the authorities became suspicious when the rehab doctor told the coroner that the former "That '70s Show" actress died from an embolism.

"Our sources say the Coroner scoffed at the doctor's conclusion, because there's no way to know if someone died of an embolism without performing an autopsy. In other words, you can't tell by looking at a dead body," the story reports.

The facility's doctor said Kelly was taking detox drugs, but because the toxicology report isn't completed, it's unclear whether those drugs played a role in her death, the story adds.

TMZ adds: "As for the embolism -- the Coroner still has not made a determination. But they ARE suspicious. And, we're told, the Sheriff has issued a security hold on the case, meaning no information can be released while the case is being investigated."

lisa-robin-kelly3.jpgLisa Robin Kelly