spatter, but the fingerprints. and then, you know, the dna off the sweater. all of those things that kind of pointed back toward george hansen. up next, a vibrant real estate professional is brutally murdered. >> this involved the entire range of violence. >> even hardened professionals are troubled by what they see. >> for there to be that much blood left at a scene, that's what we consider overkill. >> police find a possible witness and try hypnosis to get every detail. >> how many times do you see a composite sketch and you're like, this looks like every human being on the face of the planet? >> it was a real whodunit. and i hate whodunits. >> the killer leaves behind a clue, but will it be enough? >> people will kill for the most trivial of reasons.