Medical examiners have released the results of Bobbi Kristina Brown’s autopsy after her death in 2015.

The daughter of musicians Whitney Houston and Bobby Brown was found dead in a bathtub in January 2015, before passing away in July after an extended coma.

Autopsy results released by The Fulton County Medical Examiner’s office in Atlanta showed Brown had a number of drugs in her system – including morphine, a cocaine by-product, marijuana, alcohol and prescription drugs used to treat anxiety.

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The autopsy could not rule out heroin use, as heroin metabolises to morphine.

Brown was found to have died from pneumonia, caused by immersion in cold water and drug use.

Despite the cocktail of drugs, examiners were unable to determine whether Brown’s death had been accidental or suicide.

“Death was clearly not due to natural causes, but the medical examiner has not been able to determine whether death was due to intentional or accidental causes, and has therefore classified the manner of death as Undetermined,” they said in a statement.

Mother Whitney Houston was also found dead in a bathtub in 2012. Her death was ruled an accidental-drowning, complicated by cocaine use.

This latest autopsy report was released on what would have been Bobbi Kristina Brown’s 23rd birthday.

“First and foremost, 23 years ago today, Bobbi Kristina was born. Krissy will always live in my heart and soul,” her father Bobby Brown said in a statement released by his lawyer.

“I love my baby girl.

“For news affiliates to seek and obtain my daughter’s autopsy report, before anyone has been brought to justice for her death is mind-blowing to me. Please pray for my family.”