A drug supplier who allegedly sold late rapper Mac Miller deadly fentanyl pills has plead guilty, according to a plea agreement filed in California.

In 2018, the 26-year-old rapper was found dead by his assistant at his San Fernando Valley home in Los Angeles on September 7.

Per CBS News, a post-mortem examination found that Miller died from an accidental overdose, via a combination of fentanyl, cocaine, and alcohol.

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According to the agreement, Stephen Andrew Walter told an unnamed runner to distribute counterfeit oxycodone pills that contained fentanyl, CBS News reports.

Twenty-eight-year-old Cameron James Pettit allegedly supplied Miller with counterfeit oxycodone pills laced with fentanyl two days before the hip-hop star was found dead.

It's reported that Walter now faces a maximum of 20-year-sentence in prison on top of a fine of up to $1 million.

Pettit and the runner involved are also charged for the crime.

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Walter apparently knew that the pills "contained fentanyl or some other federally controlled substance", and was aware that those will be given to Pettit.

The plea document also states that Miller "would not have died from an overdose but for the fentanyl contained in the pills."

Per a 42-page criminal complaint filed in the Central District of California in September 2019, Miller allegedly asked Pettit to furnish him with "percs" - an abbreviation for Percocet - a strong prescription painkiller containing oxycodone, and also asked for "bars" of Xanax and a "ball" of cocaine.

Investigators now believe Millier died shortly after snorting the counterfeit drug.

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"When can u get em?" Miller asks, according to a transcript of the exchange contained in court filings.

"Probably in an hour or 2. They are 30 ea," Pettit replies. "Any chance I can get 10 of those, 10 bars and a ball?" Miller asks. "Yeah for sure," Pettit replies.

According to a previous affidavit, after reports of Miller’s death circulated in 2018, Pettit allegedly sent an Instagram message to a friend saying: "Most likely I will die in jail".

Miller famously dated pop star Ariana Grande for two years, before the pair split in early 2018.

Featured image credit: The Photo Access / Alamy

Drug dealer pleads guilty to distributing fentanyl-laced pills that caused Mac Miller's fatal overdose