Peaches' devastated family were told the the outcome, which is pending drink and drugs test results, following the autopsy this morning (9 April).
It is thought the outcome of a toxicology analysis will not be available to her loved ones, police and a coroner for several weeks.
Earlier today, Peaches' Instagram account was deactivated while forensic teams continued to search her home in Kent.
Kent Police previously confirmed that her death is not being treated as 'suspicious' but rather 'unexplained'.
News that Peaches had died aged just 25 was announced on Monday at just after 6pm.
Peaches' father Bob Geldof later released a statement saying that the family were "beyond pain".
The star's husband Thomas Cohen also paid tribute to his wife in a statement, saying that Peaches was "adored".
Yesterday, Peaches' sister Fifi Geldof shared a childhood picture of them both on Instagram with the message: "My beautiful baby sister... Gone but never forgotten. I love you, Peaches x."
Peaches also leaves behind two young sons, Astala, almost two, and Phaedra, who is almost one.
Peaches Geldof: Here life in pictures
Copyright: Rex Features Dennis Stone