remember the dna the medical examiner found under carol s fingernails? turned out it wasn t steve s. or jim knapp s. police called the dna, evidence item 603. but to defense investigator rich robertson, it represented much more. evidence item 603 became mr. 603. it was a male s dna that was found mixed in with carol s blood under the fingernails of her left hand. and this wasn t a small amount of dna. a reasonable person i think would think, this probably could have gotten there during an attack. reporter: jim knapp. the anonymous e-mail. mr. 603. steve s family and attorneys thought investigators should focus more on all of those things. instead, it seemed to them, prosecutors had already made up their minds, and steve would go on trial for murder. a daughter takes the stand.