According to Daily Mail, the Fulton County Medical Examiner's office in Atlanta released a statement Friday morning on the death as it prepares to release the full autopsy report.
The 22-year-old daughter of singers Whitney Houston and Bobby Brown was found face-down and unresponsive in a bathtub in her suburban Atlanta town home Jan. 31, 2015, and died in hospice care July 26.
'The drugs involved included marijuana, alcohol (ethanol), benzoylecgonine (a cocaine-related substance), benzodiazepines (medications used for sedation or to treat anxiety), and morphine.
'It could not be determined from toxicology tests whether the morphine resulted from heroin use.'
They also said he autopsy alone could not reveal the underlying cause of death because of the long interval between Ms. Brown being found unresponsive in the bathtub and her eventual death.
They also do not say if it was an accident or not.
Her death was 'clearly not due to natural causes', but they can't tell if it was due to intentional or accidental causes, and the coroner classified the manner of death Undetermined .
A judge on Thursday granted a request filed by media organizations to unseal the autopsy.