'Agents wanted Diddy for Tupac's death'

The man widely believed to have killed Tupac Shakur has sensationally revealed federal agents tried to force him to incriminate rap mogul Sean 'Diddy' Combs - and name him as the murderer.

Walter 'King Tut' Johnson is serving time in a Virginia prison for successive armed robberies after becoming the first New Yorker to be jailed for life under America's 'Three Strikes' provision.

And he believes he was served a harsher sentence than most because he refused to work with agents who were keen to put Combs behind bars.

Speaking from prison, Johnson tells America's King magazine: "(I was told) if you don't play ball and you don't give us Puff (Combs), you goin' down (sic).

"(I told them) I'm not testifying for anybody and I'm not testifying against anybody."

Johnson reveals he and Comb's history began in 1995 when the robber was attempting to put his thug life behind him and work as a confidante to the rap mogul.

He recalls: "I explained to Puffy, 'I can be beneficial to you. You don't have to give me anything - I have income coming in. I just need someone to educate me.'

"Puff was like, 'Yo, I heard some really bad things about you.'"

But the rap boss agreed to advise Johnson and urged him to study self-help book All You Need To Know About The Music Business, telling him: "I need you to take this book and study it. Learn the book by heart."