Retired LAPD Detective Claims Diddy Had Tupac Killed

Tupac, Diddy and Notorious B.I.G.

A retired Los Angeles cop is claiming that Diddy is the man behind's Tupac's decades-old murder, reports Huffington Post.

Former LAPD detective Greg Kading said he believes the hip-hop mogul offered Crips member Duane "Keffe D" Keith $1 million contract to kill Shakur and manager Suge Knight in Los Angeles... in his new documentary, Murder Rap: Inside The Biggie & Tupac Murders.

The ex-detective also claims that Suge, in retaliation, paid $13,000 to Bloods member Wardell "Poochie" Fouse to kill the late rapper Biggie Smalls.

In the doc, Kading -- who once led a task force investigating the shooting deaths of both rappers -- allegedly got a confession out of "Keffe D" because the gang member feared charges in a different crime.

"If his intention was to just get away with it, so to speak, it would have been very easy for him to not include all the details that he did," Kading told the Huffington Post.

Tupac died on Sept. 13, 1996, days after a drive-by shooting in Las Vegas, while the Notorious B.I.G. was gunned down in Los Angeles six months later on March 9, 1997.

Both murders remained unsolved.