Horrifying new details about Demi Lovato's alleged drug dealer have come to light as Lovato — who reportedly overdosed in July after relapsing — continues to seek treatment in rehab.

According to TMZ, Brandon Johnson was arrested in March "with a stash of guns, drugs and cash, according to law enforcement. When cops picked him up in North Hollywood he allegedly had narcotics, a fully loaded semi-automatic handgun and $10k in his pocket."

The site added that "Officers then searched Johnson's home and say they discovered more guns, drugs and ammo. He was also arrested in June and charged with DUI and possession of cocaine."

Johnson had reportedly been dealing to Lovato since April, but has denied supplying her with anything.

The details come just a day after TMZ published a troubling play-by-play of the night of Lovato's reported overdose.

According to TMZ, Lovato texted Johnson 4 AM on July 24 to come to her house. The site said she had been partying all night, and when Johnson arrived, the two "freebased Oxycodone on tin foil."

The site added that Lovato had no idea that Johnson had become infamous for buying less-than-clean drugs from Mexico, and that the the drugs he carried were likely laced with fentanyl, the same substance that killed Lil Peep and Prince.

Johnson reportedly fled when he noticed Lovato in bed and breathing heavily. Lovato wasn't discovered by her staff until 11:30 AM, at which point she had to be revived with Narcan by emergency professionals. She then spent two weeks in the hospital and is now splitting time between rehab and a recovery specialist's office in Chicago.

Lovato first opened up about her relapse and overdose earlier this month in an Instagram post.

"I have always been transparent about my journey with addiction," she wrote to her followers. "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," she added. "The love you have all shown me will never be forgotten and I look forward to the day where I can say I came out on the other side. I will keep fighting."

Celebrities Who Opened Up About Mental Health