Two years before his murder, Tupac Shakur was shot and robbed outside a New York recording studio. Now, a man serving a life sentence for an unrelated crime has apparently confessed to his part in the incident.

Dexter Isaac’s name was signed to a letter received by Allhiphop.com, claiming he was hired for the job by entertainment manager James “Jimmy Henchman” Rosemond, and insinuating that Rosemond and Sean “Diddy” Combs may have had something to do with Shakur’s eventual murder.

“He gave me $2,500, plus all the jewelry I took, except for one ring, which he wanted for himself. It was the biggest of the two diamond rings that we took,” details one passage of the letter. “He said he wanted to put the stone in a new setting for his girlfriend at the time, Cynthia Ried. I still have as proof the chain that we took that night in the robbery.”

Although the author refuses “to talk about my friend Biggie’s death or 2Pac’s death,” the letter promises, “I would like to give their mothers some closure. It’s about time that some one did, and I will do so at a different time.”

A spokesman for the NYPD said the department is investigating the letter to determine whether it actually came from Isaac.