No eyewitnesses, and no murder weapon connecting them or anyone else to sherri's murder, and the dna collected was useless -- at least right now. police went ahead and collected it anyway. why? >> well, at crime scenes, if you know there was possible evidence on anything, you're not going to leave it behind. so it was great forethought on their behalf actually to recover it. >> detectives scoured the condo and the entire complex. the only thing apparently stolen was from the garage. sherri's car, and that was recovered just a mile away from the crime scene with the keys still in it. the only o...