it was from brad brisbin.ed for creating what he called a real strain on everyone involved. >> i decided to start a new life for myself. i had to make a clean break from everyone and everything to make this work. it just seemed to be the only way out for me. >> a few days later, larry moore received a similar letter. in this one, brad wanted to make sure his wife reene was taken care of. >> all personal property we own, i want her to have everything. i'm starting a new life with a new person. >> but investigators noticed a slight problem. the name of brad's wife reene was misspelled. >> the letter to the sheriff, it congratulated him to his appointment and the sheriff is in an elected position, so there were huge mistakes. there were just huge red flags. >> investigators tested the letters with ninhydrin, a chemical solution that reacts to the amino acids in fingerprints. after it was applied, the documents were dried thoroughly. scientists found numerous fingerprints on the two documents, but none matched bra

occurred during brad brisbin's last moments alive. >> without it, we couldn't have proved that brad was even dead. he would still be a missing person >>> even before the attack on the world trade center in new york, intelligence agencies were watching a number of suspected terrorist cells throughout the united states. the fbi uncovered evidence of a terrible crime by some individuals using the cover of a st. louis grocery store. but it took a forensic autopsy and a tape to reveal the entire story. ♪ >>> 16-year-old tina isa was the kind of daughter most parents dream of. she was a high school athlete, popular, a straight a student and wanted to attend college and become an airline pilot. >> tina wanted to be american. tina wanted to be independent. she wanted to have a career. she wanted to travel. she wanted to be her own person. >> her mother and father, zein and maria isa, were immigrants from palestine and ran a small grocery store in downtown st. louis. >> like most immigrants, the palestinians went into the food business. that's a tradition in america. food service is one of the e