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And so there was so much of her dna that it was literally overwhelming the other contributing dna that we were finding. >> fortunately a quick-thinking paramedic at the scene had swabbed parts of rebecca body while others were trying to save her life. >> this is pretty heads-up. i know this is a crime, she was found nude, what if there's dna. it turns out, yes, there was saliva on both rebecca's neck and on her breasts. >> but when the dna profile was put in the national dna day pa base of known offenders, investigators encountered another setback. >> they did not get enough markers to work to...

Was literally overwhelming the other contributing dna that we were finding. >> fortunately a quick-thinking paramedic at the scene had swabbed parts of rebecca body while others were trying to save her life. >> this is pretty heads-up. i know this is a crime, she was found nude, what if there's dna. it turns out, yes, there was saliva on both rebecca's neck and her breasts. >> investigators encountered another setback. >> they did not get enough markers to work to compare to that database. >> investigators were fairly certain the dna belonged to the man seem with rebecca and fred in the bar ju...