so investigator mike sechez looked up the autopsy done just before carol's.tted a sample from that for re-testing. and? nearly three years after carol's murder, a call from the crime lab. >> the sample dna that we sent had matched the dna under carol kennedy's fingernails. we finally were able to discover and verify who mr. 603 is. >> mr. 603, it turned out, was another dead soul, the man lying on the autopsy table before carol got there. it was his dna. maybe on one of the coroner's instruments, that ended up under carol's fingernails. mystery solved. one more doubt removed, said the prosecution. but for steve's defense team, it was further proof of a shoddy investigation. >> contamination. we found out not only potential contamination, there was actual contamination in this case. >> how can you trust anything after that? >> exactly. >> defense attorney craig williams said the case against steve had an even bigger flaw. >> you cannot put steve democker in that house where there was a horrific murder, a bloody murder, you can't put him in the house. >> no dna