sherri rasmussen killed in her los angeles condo. sherri's parents offered to have the saliva sample from that bite mark tested for dna. they would even pay for it, but the lapd declined. >> they said we don't have a suspect. but if we have their dna, then we have something to match. the case sat for another decade. but then in 2004, conducting dna tests and one of them was the murder of sherri rasmussen. the envelope was tattered. the label torn. and the vile was poking out. but the saliva was still inside. the dna was just enough to blow this case wide open. >> and now the court indicated that the suspect that had bitten sherri rasmussen during the struggle was actually a female. >> a woman, not two male burglars as the original detectives had suspected all those years. but it would take a few more years before investigators began to understand what that crucial dna test result meant. it was now 2009, and the case was cold. no apparent leads, no suspect, no answers for the rasmussen family. then came that monday after the super bow