bill mclaughlin? investigators were talking to his girlfriend nannette who was cheating on him with another man. and when they interviewed him, he was deceptive about whether he owned a gun. meanwhile bill's daughters were trying to get their father's affairs in order. but they were about to find that things weren't adding up. the question was who else had access to bill's accounts. here again is keith morrison. >> reporter: in the afternoon on the day he was murdered, bill mclaughlin drove from a house he kept in las vegas to mccarran airport. he climbed into the little airplane he owned and flew it up above all his trouble. this is where he was free and happy, pure joy up here. just around sunset he landed at john wayne airport in orange county, called nanette to tell her he was back, and drove home to newport to the place he was about to die. but, for all their efforts, investigators could find not one bit of evidence in those final movements of his. nothing that would link him to