The official cause of Brown's death is listed as pneumonia.
"The underlying cause of death is the condition which starts the downhill course of events leading to death and in this case is the immersion associated with drug intoxication," the statement reads. "The pneumonia and encephalopathy [brain damage] are more immediate causes which resulted from the immersion and drug intoxication."
The toxicology report found marijuana, alcohol, "a cocaine-related substance," anti-anxiety medication, and morphine in her system. "It could not be determined from toxicology tests whether the morphine resulted from heroin use," the medical examiner stated.
The autopsy could not determine if Brown's death was intentional, or accidental.
"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," the statement reads.
The Fulton County medical examiner statements were released on what would have been Brown's 23rd birthday. While Brown's cause of death was determined last Sept. 25, the results were previously sealed to allow authorities to further look into the findings. But on Thursday, a superior court judge granted a motion by a news company to unseal Brown's autopsy.
Brown -- the daughter of Bobby Brown and the late Whitney Houston -- was found unresponsive in her bathtub on Jan. 31, 2015, and later placed in a medically induced coma. She died on July 26 at the age of 22 and was buried in a grave in New Jersey next to her mother.
Shortly after that, Brown's conservator filed a wrongful death lawsuit alleging that Brown died after being given a "toxic cocktail" by her boyfriend, Nick Gordon, after a late-night "cocaine and drinking binge." The suit went on to claim that Gordon "put her face down in a tub of cold water causing her to suffer brain damage."
No criminal charges have been filed against Gordon, and his lawyers have called the wrongful death civil suit "slanderous and meritless."
In a statement to ET on Friday, Bobby Brown expressed his dismay that the autopsy results have been unsealed.
"First and foremost, 23 years ago today, Bobbi Kristina was born. Krissy will always live in my heart and soul," he said. "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."
The 47-year-old singer's lawyer, Christopher Brown, said that he will continue their efforts in the civil lawsuit and the criminal investigation.
"Bobby Brown has had to be strong and mourn his loved ones in a fashion that is foreign to most people -- so public, so raw, with apparently no end in sight," he said in a statement. "Hopefully public indictments and prosecution will lead to private healing and closure for Bobby Brown and his family."