but abdel basset ali al-megrahi found guilty as charged. the court ruled this senior libyan... >> would i like to have tried the case in the united states? sure. but, i mean, i don't know what more we could have done. >> dornstein: brian murtagh was one of the top u.s. prosecutors on the case. >> i believe that the evidence was there to convict megrahi correctly and to sustain his conviction. i wish that fhimah had been convicted because i think the same should be said of him. but the judges didn't see it that way. >> after waiting 12 years, it was some level of justice. obviously, you can never bring your kid back. >> over and over today, the family members wanted to know, "will the u.s. now pursue libyan leader moammar qaddafi?" >> dornstein: the theory was that lockerbie had been revenge for the u.s. bombing of libya back in 1986. >> ...that one of moammar qaddafi's houses was hit. >> dornstein: but qaddafi always denied a role in pan am 103. his government claimed to have been pressured into paying money to families like mine and issuin

only one person, abdel basset al megrahi, was convicted and sentenced to life, but was released in 2009 because of deteriorating health. >> president obama said the u.s. deeply regrets the decision and warned libya not to give him a hero's welcome. the libyans weren't listening. >> al megrahi emerged wearing a suit, the inmate unrecognizable as he acknowledged the jubilant crowd. >> i remember being shocked by alpb his conviction hadn't been fully satisfying, but at least it was an answer. now all that was coming undone. my brother and the others had been killed, and certainty about who did it was being wiped away. >> some believe al megrahi should go free. they don't believe he was guilty in the first place. >> al megrahi is not expected to live long enough for his next appeal to be heard. >> al megrahi's release also gave momentum to those who believed he wasn't guilty at all, and theories pinning lockerbie on iran were once again revived. i wished i could let it go, but instead i decided to set out on my own search for answers. i began by tracking down the f.b.i. agent who had worked