a camera was rolling as prosecutor, fran humphries, began his case. >> this is purely mode of evidenceotive for richard gagnon to end the lives of these two people? >> as humphries recalls, the case against rick was always motivation strong, evidence weak. not much more than a drop of charlie parker's blood on shoe, when you came right down to it. even so, humphries told the court the blood put rick at the murder scene. >> but he had story for it, didn't he? >> he did. it didn't hold water but he had a story about it. >> humphries recited rick's version how blood got on his shoe, how he had gone into the parker house to get a set of car keys sometime after crime scene techs finished up. >> he went to his right in the window leading to the bathroom where big charlie died and noticed the blood. >> rick said he worried bambi pacing outside might look in the window and freak out all over again. >> he went in and stepped through the bathroom and closed the blind. >> and whoops, i stepped in the blood. that's the story, right? >> yep. >> it didn't hold up? >> no. because they were already cl