Gen. John Allen, 58, U.S. commander in Afghanistan, is under investigation for allegedly sending inappropriate messages to Jill Kelley. He denies wrongdoing, according to a senior defense official. Kelley had complained about anonymous e-mails she received, which were found to be from Paula Broadwell. The FBI probe of those e-mails led to the discovery of Broadwell's affair with CIA Director David Petraeus.