Over his life, 42-year-old David Pecard has had many careers. Among other things, he has been a lawyer, a police officer, an emergency room technician and a soldier. He has also been many people: Wayne Simms, Kenny Tyler, Thomas Michael Lamar, Brandon Lee Bailey, David Auni, Michael Simms, Robert Simms and Paul Robert Ritter, among others. Who is Pecard? No one, not even him, is quite sure. But whatever else he may be, he is also a prolific con man, who over the last 25 years has talked his way with remarkable skill into police departments and onto top secret military posts. He conducted federal investigations with the FBI, put criminals behind bars and married six women. 48 Hours Correspondent Peter Van Sant reports on this extremely unusual case.