that would be bill rothstein in my mind.e fits to a "t" the profile of someone who would commit such a bizarre and pathological crime. >> but now four years after the original crime the government had to prove in court its theory was correct. and there were two big problems. rothstein, the alleged mastermind, died before even officially being linked to the crime. the other main suspect, marjorie diehl armstrong, had told so many lies she was showing evidence of mental problems and a personality disorder. >> the mental illness was a 30-year history. the personality disorders were a 30-year history. >> over many delays and many more years, the government finally obtained convictions on charges of bank robbery and murder. life plus 30 years for marjorie diehl armstrong. a lesser sentence her accomplice kenneth barnes because he testified on behalf of prosecutors. brian wells, who died with that bomb around his neck, well, the federal government said he, too, was in on the crime. >> brian delivered the pizza. he was accosted at

and never really solved the case. >> bill rothstein died about a year after the crime.e died with, in my opinion, all the secrets, all the answers, and to that extent, nobody literally dies laughing, he went to his grave knowing that he had outfoxed every one. >> neither the u.s. attorney's office, nor the fbi, would comment to cnn about fisher's assertions. and yet there is someone who is alive. who kenneth barnes says was at rothstein's house the day of the robbery but was never charged in the crime. he is the convicted sex offender granted immunity in exchange for testimony he was never asked to give. next -- >> brian wells' family really wants to know. >> could this man hold the answers that would finally solve the case? granola thins.ouncer ] something deliciously different from nature valley. thin squares of crispy granola layered with creamy peanut butter or rich dark chocolate flavor. lightly toasted for a delicate crunch. 90 calories. 100% natural. and nature...approves. ♪ granola thins. from nature valley. nature at its most delicious. ♪ it's tsunnyd!you bring