‘16 and Pregnant’ alum Autumn Crittendon’s cause of death revealed after mom of three’s death at 27

“16 and Pregnant” alum Autumn Crittendon’s cause of death has been revealed to be “toxicity from fentanyl and para-fluorofentanyl.”

The Virginia Department of Health confirmed to TMZ on Monday that the “combination of drugs” took the late 27-year-old’s life and that her manner of death was “accidental.”

Crittendon, whose legal last name was Oxley, died on July 20 after she was found “unresponsive” at her home.

Para-fluorofentanyl is listed as a “synthetic opioid analgesic” according to the Michigan Poison & Drug Information Center. The drug was initially “synthesized for research purposes” in the ’60s.

At the time of Crittendon’s death this past summer, a rep from the Henrico County Police Department in Virginia told Page Six that paramedics “attempted life-saving measures.”

Despite their efforts, first responders were not successful and the MTV alum was “pronounced dead at the scene.”

At the time, we were told the police department was “classifying this incident as a death investigation” and that “detectives are working with the Office of the Chief Medical Examiner on this case to determine the exact cause and manner of death.”

Crittendon was reportedly found by her stepfather at their home where she lived at with him, her mother and her children, per TMZ’s July 22 report.

The former reality TV personality welcomed her son Drake, 10, with Dustin Franklin in December 2013.

Crittendon then went on to have another boy and a girl, who are almost 5 and almost 2, respectively.

At the time her death, sources told TMZ that the Season 5 alum had been experiencing heartburn and was sick.

Crittendon also reportedly was diagnosed with diabetes and had suffered from kidney issues.

Her sister, Misty Crittendon, first broke the news of Autumn’s death in a since-deleted Facebook post on July 21.

“You were robbed of your life at such a tender age, you left before anyone could tell you goodbye.. how much we love you.. how amazing you are and how proud we are of you for staying sober through some of the toughest parts of your life, how far you’ve came from where you were, how thankful we are to have had all these years with you, how proud of you we are as a mother, how grateful we are for the 3 tiny parts of your heart that are still walking this earth,” Misty wrote in part.

She continued, “Half of me died with you yesterday and I honestly don’t know how I’m ever gonna truly recover from this.

“Pulling up seeing all the vehicles, an empty ambulance.. and jumping out of the truck as soon as I could begging the paramedics and cops to tell me you were okay and they were just working to keep you alive in there.. But my worst fear was confirmed and I collapsed in the road.”