knees. why would they spot clean there? there was that other wound. remember that rather peculiar one near archie's groin? >> where would that person have to be, relative to the victim, to make that kind of an injury? and i think it would put you on your knees in order to do that. so when you look at that and you're spot cleaning on the pants, i think you have a pretty good description of how it is he got blood on his pants and what he had to do to get it off. >> finally, some physical evidence, but was it enough? d.a. john lewin didn't think so. he needed more evidence. to file murder charges. >> i wanted to get janos on tape. >> so the detectives went out and contacted janos kulcsar. >> he worked in a shop repairing electronics.