Mopreme Shakur Says Diddy Called Him to Deny Tupac Murder Involvement

Tupac Shakur's brother Mopreme says Diddy called him personally to deny involvement in the Las Vegas murder, and while folks like 50 Cent continue to fuel that rumor ... it sounds like Mopreme still wants an official verdict.

On Monday, Pac's bro was back in the hot seat for "Art Of Dialogue" -- the same platform where Tupac murder suspect Keefe D told on himself -- and Mopreme dug into his memory vault to recall the Diddy phone call.

At the time, they hadn't met, but Mo says the Bad Boy mogul knew exactly who he was and what he was about -- and wanted to tell him "man-to-man" the killing wasn't on his hands.

Mopreme says Diddy dialed him "sometime in the 2000s" ... which aligns with the 2008 Los Angeles Times story written by Chuck Philips that implicated Diddy in Tupac's murder.

The Times eventually retracted the story after the FBI reports it cited were found to be falsified.

Mopreme admits finding answers behind Pac's death has been a chore, and doesn't know what to make of Diddy's phone call to him.

For what it's worth, Keefe has previously claimed Diddy was orchestrating behind the scenes. It's unclear what he'll say in court now, should he actually stand trial for Tupac's murder.