Audrina Patridge’s niece Sadie, 15, died of a drug overdose after “purchasing Percocet from Snapchat,” police are investigating

The death of AUDRINA Patridge’s niece Sadie has been ruled a drug overdose.

The Hills star’s 15-year-old niece died in February, just days after celebrating her birthday.

Sadie’s death was officially ruled a drug overdose, law enforcement sources said TMZ On Monday.

Police have not yet determined the cause of Sadie’s death as an investigation is underway into possible criminal charges.

Cops are reportedly trying to figure out how the teen got his hands on the drugs.

Sadie was able to purchase Percocet via Snapchat and it was laced with fentanyl, a source claimed to the outlet.

If this is the case, police will try to find out who sold it to the teenager and will likely press charges.

Sadie’s mother, Casey Loza, announced her death in a devastating post on Instagram on Valentine’s Day.

“Sadie Raine Loza left this earth to fly to heaven,” Casey wrote, sharing a photo her daughter.

The mother, who is Audrina’s sister, shared a recent photo of Sadie in the caption as she continued her tribute.

“Writing this was the hardest thing I’ve ever had to do. Since I didn’t know the right words, I’ll leave it to you…”

She concluded: “Rest in peace, you brilliant starseed. You are with your Creator. We will miss you very much. I love you.”

Audrina posted two heart and two crying face emojis in the comments.

MESSAGE FROM Aunt

The MTV star also shared one long homage on her account, with lots of pictures of Sadie from over the years.

“It hurts my heart to even write this,” she began.

“My beautiful niece is in heaven now. I know it’s not goodbye forever, but it’s the hardest thing to say goodbye right now.”

“We will miss you and cherish every single moment we had with you.”

Brody Jenner, who briefly dated Audrina during her MTV heyday, commented: “I’m so sorry you lost Audrina. This is heartbreaking. Sending lots of love to you and the family.”

TEENAGE TRAGEDY

Sadie died just a week after celebrating her 15th birthday.

Casey had shared a video On Instagram you could see her daughter blowing out the candles on her cake with her family.

“I can’t believe you’re 15,” the proud mom wrote.

“It feels like the years have flown by and we still have so many more adventures ahead of us!”

Casey shares Sadie and son Sam, 12, with her motocross racer husband Kyle Loza.

Casey and Kyle filed for divorce in August, six months after Sadie’s death.

She wrote on Instagram at the time: “When Sadie died, I was so deep in my own pain that I had no room for Kyle’s.”

“We all know that I can’t do things by halves. A broken heart is not enough, we must shatter it completely. And with love I release you back into the wild.”