According to prosecutors, the rapper, who passed on at 26 last year in Los Angeles from a drug overdose, thought he had been sold a painkiller called oxycodone by the suspect.
But unknown to him it had actually been laced with fentanyl, a powerful drug fifty times more potent than heroin.
The suspect, 28-year-old CAMERON JAMES PETIT has now been arrested on suspicion of distributing a controlled substance.
Prosecutors say their evidence against him includes messages he sent after the rapper’s body was discovered.
If found guilty PETIT could spend up to twenty years behind bars.