. >> following the murders of alan and dianne johnson, investigators identified bruno santos as the primeuspect in the crime. since santos was 19 and sarah johnson was 16, the johnsons repeatedly warned santos not to see their daughter again, but santos refused. >> to try to rule bruno in or out, we tested almost every piece of clothing that he was wearing that day and the following day when we arrested him. >> we never found his dna, fingerprints or anything in the crime scene and any of alan or diane's blood or dna on any of his clothing. >> so, bruno santos was eliminated as a suspect. with no other possibilities, authorities then began to focus on the johnsons' daughter, sarah. >> no more what? >> kids. >> no more kids? >> no more! >> they learned that sarah was taking antidepressants and had a stormy relationship with her mother. sarah's relatives thought she was being a normal teenager pushing against authority, until they noticed her unusual behavior after the murders. >> she did not seem to be going through any sort of grief at all. she was not concerned at all about losing her mo