A cause of death has been announced in the recent passing of 16 & Pregnant star Autumn Crittendon, who passed away in July at the age of 27.

TMZ reports that Crittendon’s death was caused by toxicity from fentanyl and para-fluorofentanyl, a form of synthetic opioid, according to the Centers for Disease Control and Prevention. The Virginia Department of Health ruled Crittendon’s death as accidental.

Crittendon passed away July 20 in the Virginia home she shared with her children, mother and stepfather. She was reportedly found unresponsive in her bedroom by her father.

Paramedics attempted to perform CPR when they arrived at the scene but were unable to save her.

Previous reports note Crittendon was dealing with health issues at her time of death, including diabetes and issues with her kidneys.

Her sister, Misty, shared an emotional tribute to Autumn on social media that has since been deleted. Her statement refers to Autumn’s attempts at staying sober.

“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,” she wrote on Facebook, per Starcasm.

Her statement continued, “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 also organized a GoFundMe to cover funeral expenses, where she wrote, “To say it was unexpected was an understatement. It is and has been excruciatingly painful, to say the least.”

Crittendon starred in Season 5 of 16 & Pregnant in 2014, which followed her pregnancy journey and the birth of her son, Drake.

She was a mother of three at her time of death.