kevin doyle had no criminal record. but the day after the murder, he did something very strange. >> kevin shows up and offers his assistance to the family and how he, himself, can keep that business afloat. we're thinking, okay, we have a suspect here. you know, you hear so often of the overcooperative witness, so to speak. well, that was kevin. >> police also learned that maryann and her business partner, george hansen, never got along. >> it was always a challenge between the two because their personalities were so much different, they were always in conflict. >> she didn't realize that he was angry over the fact that al zullo had made her an equal partner to the business when he died. >> george said there were no problems and that his relationship with maryann was a good one. >> when you have a business, really, it's just like a marriage, you have to get along. if you don't get along, break it off. and we got along great. >> when questioned by police, george said he had an alibi for the time of the murder. >> he had