it's not like i disappeared for hours. >> you say you had no blood, people would've seen it. >> no blood no cuts. >> these are pictures from the birthday party. the man at the edge of the picture in the red hat, is gregory. most of the party said gregory was one of the first guests to arrives and one of his helpful self. >> well the separation took its toll, and gregory finally moved. he left southern california for spoken, washington. and that desiccation petered out. the case went cold. after years, it'll relinquished hope that they would never be justice for kit. which, of course, is where boyd underwood entered the story. going through that old file, those forgotten -- if he had just gotten deeper, wet secrets would be fined? >> old evidence plus new