Carrie Fisher's death confirmed as heart attack, but more tests needed posted the public documents, issued Monday by the County of Los Angeles Department of Public Health.

Actress and mother to Carrie Fisher Debbie Reynolds cause of death is finally revealed. The certificate reveals the 84-year-old suffered an intracerebral haemorrhage, caused by a ruptured blood vessel that led to bleeding in her brain.

Hypertension, which is abnormally high blood pressure, is listed as an underlying cause.

HBO had moved up the "Bright Lights" premiere shortly after both Fisher and Reynolds died a day apart of each other.

Reynolds died at 84 on December 28 at Cedars-Sinai Medical Center, the certificate says.

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The certificate states the cause of death was "cardiac arrest/deferred".

Toxicology tests are likely to be carried out, which can take several weeks to complete. Fisher's certificate said the manner of death is still "pending investigation".

She never regained consciousness and died on 27 December at the Ronald Reagan UCLA Medical Centre.

Fisher, best known for her role in the "Star Wars" saga, and Reynolds, who starred in "Singin' in the Rain", were mourned in a joint memorial at their neighbouring homes on Thursday and had a joint funeral at a Hollywood Hills cemetery the next day.

The mother and daughter were laid to rest last week, with a memorial service held in their LA compound for friends and family.