when ken durstein's brother was killed in the bombing. he began a multi-investigation that took him to war torn libya in search of the others involved. here's a preview. >> abdullah is what the others call him. >> yes. was he someone you spoke object during the investigation? >> absolutely. there was an intelligence assessment at the time that he was a technical expert, and we just couldn't ever identify him. the guy was just sort of a ghost. nobody would acknowledge him, even after the scotts went to bolivia in 1999 and asked about massoud and never heard of him. >> if you could figure him out, he was probably important? >> absolutely. he was maybe someone who had something to do with arming the bomb. >>> this is "nightly business report," with tyler mathisen and sue herera. >> mega deals. dell buys emc in the biggest tech deal of all time, and anheuser-busch makes another bid. or is that a bud? or s.a.b. miller in what would be one of the biggest takeovers ever. >>> blockbuster bust. eli lilly shares tank after it scrapped an experiment