and inside, defense attorney ron powell fretted that he'd been short of a certain advantage.d these new wrinkles. the blood on marks clothes and the knife in the kitchen butcher block. >> remember this is a retrial now. they felt this time that they needed to show a possibility of the knife. they never said this was the knife. they're just showing this knife could've done it. >> in fact, said powell, the new evidence was no more persuasive than the old. no blood, that animal fat found on the knife, how about somebody use the knife to cut a steak and then washed? >> could you wipe all the dna off a knife you put -- >> good question, i've learned now after this trial that blood will never leave clothes. but it will go right off the knife. >> as for the blood on marks clothes, of course there was blood, said the defense. he handled her body. and police didn't see the blood at first because, his shirt was read. and his shorts were black. and then there was the new prosecutors insistence that karen was very unhappy in her marriage and wanted a divorce. >> was it true. ? >> no, the