Aaron Carter drowned after huffing compressed gas and taking generic Xanax, according to the Los Angeles County Medical Examiner’s autopsy report obtained by The Post.

Carter had inhaled difluoromethane, an orderless gas, and taken alprazolam, a benzodiazepine that is generic Xanax, which resulted in him being submerged underwater a bathtub at his Lancaster, California, home on Nov. 5, ultimately leading to his death, read the report released Tuesday.

It was previously reported that compressed air cans and pill bottles were found at the scene.

He was 34. The manner of death is accidental.

The Post has contacted reps for Carter for comment.

His ex-fiancée and mother of his child, Melanie Martin, told TMZ on Tuesday: “The results of the autopsy are not closure for me. It claims death is by drowning but also adds he was wearing a t-shirt and necklace in the bathtub which doesn’t make sense, why would he be in a bathtub with clothes on?”

“I am still in shock and still miss Aaron every day. I don’t understand the chain of events and this report only has us asking more questions,” she added.

Martin previously stated that she believed Carter was murdered.

His death certificate was made public on Nov. 16 and stated that he had been cremated less than a week after his death. An autopsy was performed but his cause of death was deferred, pending a toxicology report.

The “Sooner Or Later” singer had struggled with his mental health in the years before his death. He appeared on “The Doctors” in 2017 malnourished and tested positive for “a mixture of benzodiazepines with opiates” that he claimed were persecuted for anxiety and sleeping.

He returned to the show in 2019 and claimed to have been diagnosed with schizophrenia and bipolar disorder.

Carter also became estranged from his family in those years as both Angel and Nick sought a restraining order against Aaron in 2019 after he expressed that he had thoughts to kill Nick’s then-pregnant wife.

Carter’s sister, Leslie, died of a drug overdose in 2012. He accused her of sexually assaulting him in his preteen years.

As the kid brother of Backstreet Boys member Nick Carter, a then 9-year-old Aaron served as the group’s opening act on tour in 1997. He shortly after signed a record deal, and solidified himself as a household name in his own right with hits like “I Want Candy” and “Aaron’s Party.”

A young love triangle with Hilary Duff and Lindsey Lohan circa 2003 didn’t hurt his fame, either. Both of his former teenage flames released statements after his death.