Gossip website TMZ has obtained both Debbie Reynolds and Carrie Fisher's death certificates.
Fisher's cause of death has been listed as "cardiac arrest/deferred."
More tests including a toxicology will be performed by the Los Angeles County Coroner’s Office to determine what caused the heart attack.
Reynolds's cause of death has been listed as a intracerebral haemorrhage. The star died from a ruptured blood vessel that caused bleeding on the brain.
Fisher and Reynolds were laid to rest on Saturday at a private funeral.
