Her mother, legendary Singin' in the Rain star Debbie Reynolds, died just one day later after being rushed to the hospital following a stroke. The certificate lists high blood pressure as an underlying cause.
HBO's Carrie Fisher-Debbie Reynolds documentary "Bright Lights" shined for 1.556 million total viewers with its Saturday night premiere.
Reynolds died at 84 on December 28 at Cedars-Sinai Medical Center, the certificate says.
HBO had moved up the "Bright Lights" premiere shortly after both Fisher and Reynolds died a day apart of each other.
According to TMZ, who have obtained Reynolds' death certificate, the actress's official cause of death is listed as an "intracerebral haemorrhage" or stroke. The "deferred" designation indicates that more investigation is needed by the county coroner, usually in the form of toxicology tests that can take several weeks to complete.
The certificate says Fisher had been in the entertainment business for 46 years.
Fisher had been in London filming the latest season of Amazon's "Catastrophe".
The legendary actress died December 28 at the age of 84 at Cedars-Sinai Medical Center in Los Angeles, just a day after daughter Carrie Fisher died.
The mother and daughter were laid to rest last week, with a memorial service held in their LA compound for friends and family.
She died four days later, aged 60, at the Ronald Reagan UCLA Medical Center.