The inmate was quoted on the website allhiphop.com this week admitting to being a part of the attack and saying he was paid by a music mogul for it.
While Shakur survived the 1994 attack, he was fatally shot in Las Vegas in 1996. Wallace was shot and killed in 1997 in Los Angeles. Both murders have not been solved.
The 1994 shooting and robbing of Shakur is viewed as sparking the infamous West Coast versus East Coast feud in rap music, which ultimately led to the shooting deaths of both Wallace and Shakur.
The hip hop website named the inmate as Dexter Isaac and said he is an inmate currently serving life in prison for an unrelated murder and robbery.