caroline olson died of her wounds ten days later. kenneth olson survived his wounds. he result -- ultimately identified pratt as one of the killers even though he claimed he had an alibi. >> i was in oakland, california. >> doing what? >> attending a meeting with the black panther party that we were conducting with the black union. >> reporter: so if he is telling the truth how can a man spend 23 years in prison for a murder he didn't do? according to he and his defenders, the answer to that question is a complex web of alleged perjury and dirty tricks by the la times and the fbi. johnny cochrane was his attorney in that 1972 murder trial. >> they lied and cheated and did everything and stoled his freedom. >> reporter: fbi agent wes swearinger. >> essentially he was framed for murder in order to neutralize him as leader of the black panther party in la. >> reporter: is there any question in your mind that, to use your word, that he was framed? >> none whatsoever. >> reporter: fbi wiretaps lead credence to his claim of innocence. this is a local wiretap on central cent