test kit, and his footprints were compared to the bloody footprints at the crime scene. >> it was just a matter of days that we got those results back, and conclusively excluded him as a suspect of this homicide. it was not his footprint. it was not his dna type that was left behind. >> the case went cold again. investigators never gave up, but they were running out of ideas. three years later, on a hunch, they revisited the scene of the crime, not even sure what they were looking for. >> we were just looking around, because it had sat there for several years, vacant. >> was there anything they missed, something they hadn't thought of? and then they found a potential clue. >> right on the floor in the kitchen area is the bra.