diabetes and high blood pressure. >> reporter: but u.s. officials say if koussa will talk, he could be a treasure-trove of information. for years the former head of libyan intelligence was one of moammar gadhafi's closest advisers. a senior u.s. official tells cnn he could provide inside information on the libyan leader. like his where abouts, his closest associates, control over his military and what would drive him to leave libya. moussa koussa, a graduate of michigan state university, was a main libyan negotiator with the u.s. and britain on gadhafi's decision to give up his nuclear weapons. he was also suspected in involvement of the 1988 bombing of pan-am 103. he play ad key role in groeshting the groesht i negotiating the release of the lockerbie bomber. he's not being given immunity from prosecution. libyan rebels want to put koussa