Police have said repeatedly that Powell has hampered the investigation by refusing to answer several questions. Investigators have been out to the area where Powell reportedly took the boys. But they have not found any evidence to corroborate his story and said he would not show them the exact camping location.
Investigators said they have uncovered an e-mail from Susan Powell in which she tells friends that her marriage is troubled.
Joshua Powell hired noted Salt Lake City criminal defense attorney Scott Williams as attention turned on him.
Williams has previously told ABC News that Powell was not going to comment and that Powell would rather keep the focus on the search for his wife.
Susan Powell's family launched a public relations blitz on social networking sites last month with the hope that someone has additional clues.
CLICK HERE to view the Susan Powell video on YouTube.
Anyone with information regarding the case can call West Valley City police at (801) 840-4000.
ABC News' Sarah Netter contributed to this report.