Demi Lovato allegedly "smoked Oxycodone possibly laced with fentanyl" before she was found collapsed at her home in Los Angeles at the end of last month.
The 25-year-old singer is currently in rehab following a suspected overdose three weeks ago but, although details on the incident are being tightly guarded, it's been claimed that she had inhaled a painkiller combined with the depressant drug - the same medication that killed Prince - and that led to her falling unconscious.
According to TMZ, Demi allegedly contacted a drug dealer via text message in the early hours of July 24 and asked him to join her at her home in Hollywood Hills.
The pair then allegedly smoked Oxycodone "on tin foil" but the 'Sorry Not Sorry' hitmaker was completely unaware that it may have been laced with fentanyl as the dealer had a "bad habit of buying [tainted] drugs from Mexico."
The dealer - who the singer had reportedly been seeing since April - stayed overnight but allegedly fled the scene when he noticed that Demi was breathing heavily in bed and it wasn't until 11:30 the next morning that her staff found her unconscious.