The woman was killed in the incident.
I'll try to find the story now... It happened several years ago...
I'm not knocking you or anything...it is just hard to comment on a case or see what point is makes with only some facts.
As I mentioned in my earlier posts, I can see how her failing to admit to sex with someone else could have screwed the case. Other than that scenario, I fail to see how a lack of DNA would factor in the case you describe.