Lovato, 25, reportedly texted Johnson, 31, at about 4 a.m. to come to her Hollywood Hills residence.
The site alleges that Johnson’s “dirty drugs” were purchased from Mexico and were laced with fentanyl, the same powerful opioid that killed Prince.
Johnson reportedly left Lovato’s home when he noticed she was in bed and breathing heavily.
The assistant immediately called 911, requesting that EMTs not use sirens on their way to the scene.
The “Tell Me You Love Me” singer was reportedly revived with Narcan, a drug that reverses opiate overdoses, though it’s speculated that she used a combination of drugs that may have included meth before she was hospitalized.
Sources told TMZ that Johnson had been connected to Lovato since April, when he allegedly first began supplying her with drugs.
Johnson is said to have told friends he was romantically involved with Lovato and denied selling her drugs, though TMZ says other sources deny she and Johnson ever had a romantic relationship.
While Lovato’s relationship status at the time of her overdose is unclear, insiders claimed that those closest to her took issue with someone she was dating close to the time of her hospitalization.
“This is a very serious matter and it seems like most of the people who witnessed her drug use and/or participated are now nowhere to be seen,” a source told “Entertainment Tonight” last month. “She was dating someone who her family didn’t approve of and they wanted her to stay far away from him, but she believes she can make her own decisions about who she hangs out with and who she dates.”
The Los Angeles Daily News reported that Johnson was busted for felony possession of narcotics and a firearm in March.
He also allegedly had $10,000 in cash in his pocket at the time of his arrest and was carrying a fully loaded semi-automatic handgun, the LAPD claimed.
Police alleged that when they searched his residence, they found “additional narcotics, ammunition, [a] high capacity gun, rifle magazines and three handguns, one of which was stolen.”
TMZ reported that Johnson was also arrested in June and charged with alleged DUI and cocaine possession.
A rep for Lovato did not immediately return a request for comment on the nature of her relationship with Johnson.
Lovato spoke out about her recovery earlier this month, writing on Instagram, “I have always been transparent about my journey with addiction. What I’ve learned is that this illness is not something that disappears or fades with time. It is something I must continue to overcome and have not done yet … I now need time to heal and focus on my sobriety and road to recovery … I look forward to the day where I can say I came out on the other side.”